NEET Biology Molecular basis of Inheritance / विरासत का आणविक आधार Question Bank

done Nucleic acid (DNA/RNA) Total Questions - 133

• question_answer1)
  Which one of the following is a base analogue [BHU 1984]
  A)
  Nitrous acid done clear
  B)
  Colchicine done clear
  C)
  5 - bromouracil done clear
  D)
  Caffeine done clear
  View Solution play_arrow

• question_answer2)
  Isolation and purification of specific DNA segment from a living organism was achieved by [CBSE PMT 1993]
  A)
  Crick done clear
  B)
  Nirenberg done clear
  C)
  Khorana done clear
  D)
  Beckwith and his colleagues done clear
  View Solution play_arrow

• question_answer3)
  Cyclic adenosine monophosphate was discovered by [DPMT 1993]
  A)
  Bekhor et al done clear
  B)
  E.W. Sutherland done clear
  C)
  Beerman done clear
  D)
  Weismann done clear
  View Solution play_arrow

• question_answer4)
  Clover leaf model of tRNA has
  A)
  Acceptor arm and C arm done clear
  B)
  Anticodon arm done clear
  C)
  D arm done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer5)
  Micrococcas nuclease enzyme
  A)
  Cuts the DNA from a specific site done clear
  B)
  Joins the DNA segment done clear
  C)
  Cuts the DNA at the junction between nucleosome done clear
  D)
  Binds the DNA with histone done clear
  View Solution play_arrow

• question_answer6)
  The mean diameter of DNA double helix is
  A)
  \[20\overset{\text{o}}{\mathop{\text{A}}}\,\] done clear
  B)
  \[3.4\overset{\text{o}}{\mathop{\text{A}}}\,\] done clear
  C)
  \[4.5\overset{\text{o}}{\mathop{\text{A}}}\,\] done clear
  D)
  \[10\overset{\text{o}}{\mathop{\text{A}}}\,\] done clear
  View Solution play_arrow

• question_answer7)
  If an isolated strain of DNA is kept at\[82-90{}^\circ C\], then [CPMT 1991, 95]
  A)
  It changes into RNA done clear
  B)
  It divides into one million pieces done clear
  C)
  No effect done clear
  D)
  It uncoils into helixes done clear
  View Solution play_arrow

• question_answer8)
  The length of a helix of DNA is
  A)
  \[10\overset{o}{\mathop{A}}\,\] done clear
  B)
  \[20\overset{o}{\mathop{A}}\,\] done clear
  C)
  \[30\overset{o}{\mathop{A}}\,\] done clear
  D)
  \[34\overset{o}{\mathop{A}}\,\] done clear
  View Solution play_arrow

• question_answer9)
  Which site of a t-RNA molecule hydrogen bonds to a m-RNA molecule [MP PMT 1993, 2002]
  A)
  Codon done clear
  B)
  Anticodon done clear
  C)
  5¢ end of the t-RNA molecule done clear
  D)
  3¢ end of the t-RNA molecule done clear
  View Solution play_arrow

• question_answer10)
  How many types of ribonucleic acids are known
  A)
  One type done clear
  B)
  Two types done clear
  C)
  Three types done clear
  D)
  Four types done clear
  View Solution play_arrow

• question_answer11)
  The element absent in RNA is [AMU 2005]
  A)
  Nitrogen done clear
  B)
  Sulpher done clear
  C)
  Oxygen done clear
  D)
  Hydrogen done clear
  View Solution play_arrow

• question_answer12)
  Who was awarded Nobel Prize for synthesis of RNA in 1959 [BVP 2003]
  A)
  S. Ochoa done clear
  B)
  A. Kornberg done clear
  C)
  H. Khorana done clear
  D)
  Nirenberg done clear
  View Solution play_arrow

• question_answer13)
  Breakthrough of the year 2002 [Kerala CET 2003]
  A)
  cDNA done clear
  B)
  16 SrRNA done clear
  C)
  rDNA done clear
  D)
  miRNA done clear
  View Solution play_arrow

• question_answer14)
  Uridine monophosphate is found in [Kerala CET 2002]
  A)
  Centrosome done clear
  B)
  Lysosome done clear
  C)
  Cell wall done clear
  D)
  RNA done clear
  View Solution play_arrow

• question_answer15)
  Franklin and Wilkins showed that DNA [DPMT 1993]
  A)
  Contains four bases done clear
  B)
  Is a helix done clear
  C)
  Has equal amount of adenine and thymine done clear
  D)
  Is made up of nucleotides done clear
  View Solution play_arrow

• question_answer16)
  Feulgen reaction is a special test for [BHU 1983; AFMC 1983; CPMT 1985; MP PMT 2000]
  A)
  RNA done clear
  B)
  DNA done clear
  C)
  Protein done clear
  D)
  Carbohydrate done clear
  View Solution play_arrow

• question_answer17)
  Which one of the following is not a process of DNA replication
  A)
  Palindromic done clear
  B)
  Dispersive done clear
  C)
  Conservative done clear
  D)
  Semiconservative done clear
  View Solution play_arrow

• question_answer18)
  In which type of DNA replication of the two newly formed molecules one is purely a new one and the other one is old
  A)
  Conservative done clear
  B)
  Semiconservative done clear
  C)
  Dispersive done clear
  D)
  Both (a) and (b) done clear
  View Solution play_arrow

• question_answer19)
  Semiconservative model of DNA replication was proposed by which workers in eukaryotes [MP PMT 1994, 96]
  A)
  Taylor, Woods and Hughes done clear
  B)
  Messelson and Stahl done clear
  C)
  Nirenberg and Khorana done clear
  D)
  Watson and Crick done clear
  View Solution play_arrow

• question_answer20)
  For providing evidence in favour of semiconservative way of DNA replication; Taylor, Woods and Hughes performed experiments on
  A)
  Drosophila done clear
  B)
  Pisum sativum done clear
  C)
  Allium sepa done clear
  D)
  Vicia faba done clear
  View Solution play_arrow

• question_answer21)
  Process of DNA replication is effected by an enzyme called
  A)
  Ligase done clear
  B)
  Mutase done clear
  C)
  Ribonuclease done clear
  D)
  Polymerase I done clear
  View Solution play_arrow

• question_answer22)
  Which  one of the following is called polynucleotide joining enzyme [CBSE PMT 2002]
  A)
  Polymerase I done clear
  B)
  Polymerase II done clear
  C)
  Ligase done clear
  D)
  Ribonuclease done clear
  View Solution play_arrow

• question_answer23)
  Who first suggested bidirection DNA replication process
  A)
  M. Masters done clear
  B)
  P. Broda done clear
  C)
  (a) and (b) both done clear
  D)
  Meselson done clear
  View Solution play_arrow

• question_answer24)
  Who used heavy nitrogen N15 for proving semiconservative way of DNA replication [MP PMT 1993]
  A)
  Masters and Broda done clear
  B)
  Meselson and Stahl done clear
  C)
  Watson and Crick done clear
  D)
  Jacob and Monad done clear
  View Solution play_arrow

• question_answer25)
  Which form of RNA is most heterogeneous [Haryana PMT 2005]
  A)
  tRNA done clear
  B)
  mRNA done clear
  C)
  rRNA done clear
  D)
  hnRNA done clear
  View Solution play_arrow

• question_answer26)
  The name "mRNA'' was given by
  A)
  Kornberg and Khorana done clear
  B)
  Khorana and Nirenberg done clear
  C)
  Jacob and Monad done clear
  D)
  Messelson and Stahl done clear
  View Solution play_arrow

• question_answer27)
  In eukaryotes mRNA transcribed is called
  A)
  Heterogenous nuclear RNA done clear
  B)
  tRNA done clear
  C)
  Genetic RNA done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer28)
  Life span of mRNA in E. coli is
  A)
  Less than one minute done clear
  B)
  2 minutes done clear
  C)
  Five minutes done clear
  D)
  More than 10 minutes done clear
  View Solution play_arrow

• question_answer29)
  Average life span of mRNA in eukaryotes is
  A)
  5 minutes done clear
  B)
  10 minutes done clear
  C)
  30 minutes done clear
  D)
  More than one hour done clear
  View Solution play_arrow

• question_answer30)
  In which form of RNA most nucleotides are in modified form
  A)
  mRNA done clear
  B)
  rRNA done clear
  C)
  tRNA done clear
  D)
  hnRNA done clear
  View Solution play_arrow

• question_answer31)
  On which part of tRNA, amino acid gets linked
  A)
  Anticodon loop done clear
  B)
  Variable loop done clear
  C)
  3¢ end done clear
  D)
  5¢ end done clear
  View Solution play_arrow

• question_answer32)
  Enzyme aminoacyl synthetase is responsible for
  A)
  Initiating mRNA synthesis done clear
  B)
  Charging tRNA molecules done clear
  C)
  Combining tRNA at P site of mRNA done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer33)
  Which enzyme is responsible for linking the fragments of DNA [CBSE PMT 1996]
  A)
  DNA polymerase III done clear
  B)
  Endonuclease done clear
  C)
  DNA polymerase I done clear
  D)
  DNA ligase done clear
  View Solution play_arrow

• question_answer34)
  A DNA molecule in which both strands have radioactive thymidine is allowed to duplicate in an environment containing non-radioactive thymidine. What will be the correct number of DNA molecules that contain some radioactive thymidine after three duplications [AIIMS 1980; DPMT 1993]
  A)
  There will be four such molecules done clear
  B)
  There will be eight such molecules done clear
  C)
  There will be only one such molecule done clear
  D)
  There will be two such molecules done clear
  View Solution play_arrow

• question_answer35)
  DNA polymerase helps in [BHU 1987; CPMT 2003]
  A)
  Joining bits of DNA done clear
  B)
  Splitting or separation of two strands of DNA done clear
  C)
  Renaturation done clear
  D)
  Denaturation done clear
  View Solution play_arrow

• question_answer36)
  Which one of the following ratio is constant in DNAs of different species [AIIMS 1986]
  A)
  A + T / C + G done clear
  B)
  A + G / T + C done clear
  C)
  A + C / U + G done clear
  D)
  A + U / C + G done clear
  View Solution play_arrow

• question_answer37)
  Histone occupies the major grooves of DNA at an angle of [CPMT 1984; CBSE PMT 2002]
  A)
  \[{{15}^{o}}\] done clear
  B)
  \[{{90}^{o}}\] done clear
  C)
  \[{{45}^{o}}\]to the helix axis done clear
  D)
  \[{{30}^{o}}\]to the helix axis done clear
  View Solution play_arrow

• question_answer38)
  Synthesis of DNA takes place by [CPMT 1989, 2003]
  A)
  Transduction done clear
  B)
  Transcription done clear
  C)
  Transformation done clear
  D)
  Replication done clear
  View Solution play_arrow

• question_answer39)
  Chemically DNA differs from RNA in having [Bihar MDAT 1992; CPMT 1996, 2003; Pb. PMT 2000; MP PMT 1998, 2001; J&K CET 2005]
  A)
  Thymine in place of uracil done clear
  B)
  Single strand done clear
  C)
  Ribose sugar instead of deoxyribose sugar done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer40)
  The carrier of genetic information is [DPMT 1991]
  A)
  DNA done clear
  B)
  Ribosomal RNA done clear
  C)
  Ribosomes done clear
  D)
  Transfer RNA done clear
  View Solution play_arrow

• question_answer41)
  DNA is found primarily [AMU 1990]
  A)
  In cell nucleus done clear
  B)
  Outside the cell nucleus done clear
  C)
  In cell cytoplasm done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer42)
  The one which is capable of self-replication is [CPMT 1993; CMC Vellore 1994]
  A)
  DNA done clear
  B)
  RNA done clear
  C)
  Enzyme done clear
  D)
  Protein done clear
  View Solution play_arrow

• question_answer43)
  Which one of the following pair is correctly matched [MP PMT 1993]
  A)
  Frederick Griffith Discovered the phenomenon of transformation done clear
  B)
  Linus Pauling Isolated the DNA for the first time done clear
  C)
  Francis Crick Proposed one gene one polypeptide hypothesis done clear
  D)
  George Beadle Proposed the concept of inborn errors done clear
  View Solution play_arrow

• question_answer44)
  Match the following and mark the correct option Column A Column B (i) Oncogenes (1) Causes AIDS (ii) Single circular DNA (2) Lac-Operon concept (iii) Splicing (3) Component of bacterial chromosome (iv) Jacob and Monad (4) Processing of mRNA molecules (5) When activated cause cancer (i) (ii) (iii) (iv)
  A)
  (5) (4) (1) (2) done clear
  B)
  (5) (3) (4) (1) done clear
  C)
  (5) (3) (4) (2) done clear
  D)
  (1) (3) (4) (2) done clear
  View Solution play_arrow

• question_answer45)
  Catalytic property of RNA was discovered by
  A)
  Altmann and Bend done clear
  B)
  Ochoa and Korenberg done clear
  C)
  Altmann and Cock done clear
  D)
  Fuelgen and Beherence done clear
  View Solution play_arrow

• question_answer46)
  A model that relates repetitive DNA sequences and their transcripts of regulation in eukaryotes was proposed by
  A)
  Jacob and Monad done clear
  B)
  Britton and Davidson done clear
  C)
  Nilsson Ehle done clear
  D)
  H.J. Muller done clear
  View Solution play_arrow

• question_answer47)
  Who among the following scientists developed cytochemical technique for the presence of DNA
  A)
  Johannsen done clear
  B)
  Feulgen and Rossenbeck done clear
  C)
  McClintock done clear
  D)
  M.H.F. Wilkins done clear
  View Solution play_arrow

• question_answer48)
  Replication of DNA is in [Pb. PMT 1999; MP PMT 2001; Haryana PMT 2005]
  A)
  \[3'\to 5'\]direction done clear
  B)
  \[2'\to 5'\]direction done clear
  C)
  Both \[3'\to 5'\]direction and \[5'\to '\]direction done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer49)
  DNA replication is aided by [AFMC 1995; BCECE 2005]
  A)
  DNA polymerase only done clear
  B)
  DNA ligase only done clear
  C)
  Both DNA polymerase and ligase done clear
  D)
  RNA polymerase done clear
  View Solution play_arrow

• question_answer50)
  If the DNA codons are ATG ATG ATG and a cytosine base is inserted at the beginning, which of the following will result [CBSE PMT 1995]
  A)
  A non-sense mutation done clear
  B)
  CA TGA TGA TG done clear
  C)
  CAT GAT GAT G done clear
  D)
  C ATG ATG ATG done clear
  View Solution play_arrow

• question_answer51)
  Adenine is 30% then what would be the % of guanine [Haryana PMT 2005]
  A)
  10% done clear
  B)
  20% done clear
  C)
  30% done clear
  D)
  40% done clear
  View Solution play_arrow

• question_answer52)
  Okazaki fragments are joined in 3 correct sequence by  [Kerala PMT 2005]
  A)
  DNA polymerase done clear
  B)
  DNA ligase done clear
  C)
  RNA polymerase done clear
  D)
  Primase (e) Helicase done clear
  View Solution play_arrow

• question_answer53)
  Ribozyme is [BHU 1995]
  A)
  RNA without sugar done clear
  B)
  RNA without phosphate done clear
  C)
  RNA having enzymic activity done clear
  D)
  RNA with extra phosphate done clear
  View Solution play_arrow

• question_answer54)
  If the DNA strand has the nitrogenous base sequence ATTGCC, the mRNA will have [Manipal 1995; DPMT 2003; Kerala 2004]
  A)
  ATTGCA done clear
  B)
  ATCGCC done clear
  C)
  UGGACC done clear
  D)
  UAACGG done clear
  View Solution play_arrow

• question_answer55)
  DNA is methylated at [Orissa JEE 2005]
  A)
  A-residue done clear
  B)
  G-residue done clear
  C)
  T-residue done clear
  D)
  C-residue done clear
  View Solution play_arrow

• question_answer56)
  Purines of DNA are represented by [CPMT 1980; MP PMT 1986; CBSE PMT 1996;  J&K CET 2002]
  A)
  Uracil and thymine done clear
  B)
  Guanine and adenine done clear
  C)
  Uracil and cytocine done clear
  D)
  Thymine and cytocine done clear
  View Solution play_arrow

• question_answer57)
  A nucleoside differs from a nucleotide in not having [MP PMT 1995; J&K CET 2002]
  A)
  Phosphate done clear
  B)
  Sugar done clear
  C)
  Nitrogen base done clear
  D)
  Phosphate and sugar done clear
  View Solution play_arrow

• question_answer58)
  Watson and Crick are known for their discovery that DNA   [CPMT 1979; BHU 1980; DPMT 1983; MP PMT 1995;  J&K CET 2002; BVP 2004]
  A)
  Is a single stranded helix done clear
  B)
  Contains deoxyribose only done clear
  C)
  Is a double stranded helix done clear
  D)
  Synthesizes rRNA done clear
  View Solution play_arrow

• question_answer59)
  If the base sequence in one polynucleotide series of DNA is G-C-A-T-G, what shall be the sequence in the replicated complementary strand [MP PMT 1995]
  A)
  G-C-A-T-G done clear
  B)
  C-G-T-A-C done clear
  C)
  A-T-G-C-G done clear
  D)
  G-C-A-T-C done clear
  View Solution play_arrow

• question_answer60)
  Phosphorus is present in [J&K CET 2005]
  A)
  Protein done clear
  B)
  DNA done clear
  C)
  RNA done clear
  D)
  Both DNA and RNA done clear
  View Solution play_arrow

• question_answer61)
  The enzyme which can cut molecules of DNA into segments is known as [CPMT 1995; MP PMT 1995; BHU 1995; CBSE PMT 2001; Orissa PMT 2002; Kerala CET 2003]
  A)
  DNA polymerase done clear
  B)
  DNA ligase done clear
  C)
  Restriction enzyme done clear
  D)
  DNA gyrase done clear
  View Solution play_arrow

• question_answer62)
  DNA consists of two complementary nucleotide chains. If the sequence of nucleotide in one of the chains is AGCTTCGA, then the nucleotide sequence in the other chain shall be [BHU 1994; MP PMT 2000; DPMT 2003]
  A)
  TAGCATAT done clear
  B)
  GATCCTAG done clear
  C)
  TCGAAGCT done clear
  D)
  GCTAAGCT done clear
  View Solution play_arrow

• question_answer63)
  Eukaryotes differ from prokaryotes in the mechanism of DNA replication due to [BHU 1994]
  A)
  Different enzymes (instead of same enzyme) for synthesis of lagging and leading strands done clear
  B)
  Discontinuous rather than semidiscontinuous replication done clear
  C)
  Use of DNA primers rather than RNA primers done clear
  D)
  Unidirectional rather than bidirectional replication done clear
  View Solution play_arrow

• question_answer64)
  Mode of DNA replication in E. coli is [CPMT 2005]
  A)
  Conservative and unidirectional done clear
  B)
  Semi conservative and unidirectional done clear
  C)
  Conservative and bidirectional done clear
  D)
  Semi conservative and bidirectional done clear
  View Solution play_arrow

• question_answer65)
  The A/U and G/U ratio in RNA is
  A)
  \[\ne 0\] done clear
  B)
  = T / A Ratio done clear
  C)
  = A / T Ratio done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer66)
  Okazaki segments are formed during [CBSE PMT 1996]
  A)
  Replication done clear
  B)
  Transduction done clear
  C)
  Transcription done clear
  D)
  Translation done clear
  View Solution play_arrow

• question_answer67)
  Ribosomal RNA is synthesised in [MP PMT 1996]
  A)
  Nucleolus done clear
  B)
  Nucleosome done clear
  C)
  Ribosome done clear
  D)
  Lysosome done clear
  View Solution play_arrow

• question_answer68)
  DNA is transcribed by some viral RNA using the enzyme [MP PMT 1996]
  A)
  DNA polymerase done clear
  B)
  Reverse transcriptase done clear
  C)
  Endonuclease done clear
  D)
  Ligase done clear
  View Solution play_arrow

• question_answer69)
  The bacterial genome contains [MP PMT 1996; BHU 2002]
  A)
  DNA and histone done clear
  B)
  DNA or histone done clear
  C)
  DNA without histone done clear
  D)
  Neither DNA nor histone done clear
  View Solution play_arrow

• question_answer70)
  Transcription of DNA is aided by [MP PMT 1996, 2001, CPMT 2001]
  A)
  RNA polymerase done clear
  B)
  DNA polymerase done clear
  C)
  Exonuclease done clear
  D)
  Recombinase done clear
  View Solution play_arrow

• question_answer71)
  Which one statement regarding "Okazaki fragment'' is correct
  A)
  These are double helical fragments of DNA done clear
  B)
  These are single stranded fragments of DNA done clear
  C)
  These are fragments of mRNA done clear
  D)
  These are fragments of tRNA done clear
  View Solution play_arrow

• question_answer72)
  Nobel prize winner E.W. Sutherland demonstrated
  A)
  Mechanism of action of cAMP done clear
  B)
  tRNA done clear
  C)
  Operon model done clear
  D)
  mRNA done clear
  View Solution play_arrow

• question_answer73)
  Okazaki fragments are synthesised on [CPMT 2005]
  A)
  Leading strands of DNA only done clear
  B)
  Lagging strands of DNA only done clear
  C)
  Both leading and lagging strands of DNA done clear
  D)
  Complementary DNA done clear
  View Solution play_arrow

• question_answer74)
  mRNA is a polymer of [MP PMT 1997]
  A)
  Deoxyribonucleosides done clear
  B)
  Ribonucleosides done clear
  C)
  Deoxyribonucleotides done clear
  D)
  Ribonucleotides done clear
  View Solution play_arrow

• question_answer75)
  Non-genetic RNA is of [MP PMT 1999, 2000]
  A)
  Two types done clear
  B)
  Three types done clear
  C)
  Only one type done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer76)
  What is the type of coiling in DNA [MP PMT 1999]
  A)
  Right-handed done clear
  B)
  Left-handed done clear
  C)
  Zig-Zag done clear
  D)
  Opposite done clear
  View Solution play_arrow

• question_answer77)
  The successive nucleotides of RNA are covalently linked through or antiparallel [CPMT 1999; JIPMER 2001; MP PMT 2001]
  A)
  Glycosidic bonds done clear
  B)
  Phosphodiester bonds done clear
  C)
  Hydrogen bonds done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer78)
  DNA multiplication is called [CPMT 1998, 2003; KCET 1999; MP PMT 2003]
  A)
  Replication done clear
  B)
  Transduction done clear
  C)
  Transcription done clear
  D)
  Translation done clear
  View Solution play_arrow

• question_answer79)
  Recombinant DNA is achieved by cleaving the pro-DNAs by [CBSE PMT 1998]
  A)
  Primase done clear
  B)
  Exonucleases done clear
  C)
  Ligase done clear
  D)
  Restriction endonuclease done clear
  View Solution play_arrow

• question_answer80)
  The chemical knives of DNA are [CBSE PMT 1998]
  A)
  Ligases done clear
  B)
  Polymerases done clear
  C)
  Endonucleases done clear
  D)
  Transcriptases done clear
  View Solution play_arrow

• question_answer81)
  Restriction endonucleases are [CBSE PMT 1998]
  A)
  Synthesized by bacteria done clear
  B)
  Present in mammalian cells for degradation of DNA done clear
  C)
  Used in genetic engineering done clear
  D)
  Used for in vitro DNA synthesis done clear
  View Solution play_arrow

• question_answer82)
  Which of the following RNAs picks up specific amino acid (from amino acid pool) in the cytoplasm to ribosome during protein synthesis [AIIMS 1998; CBSE PMT 1997]
  A)
  tRNA done clear
  B)
  mRNA done clear
  C)
  rRNA done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer83)
  Which of the following is nongenetic, which is utilised for protein synthesis [AIIMS 1998]
  A)
  DNA done clear
  B)
  zRNA done clear
  C)
  mRNA done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer84)
  The substance that acts as connecting link between two generations is [RPMT 1997]
  A)
  Ribonucleic acid done clear
  B)
  Deoxyribonucleic acid done clear
  C)
  Nucleoplasm done clear
  D)
  Ribonucleic acid + Deoxyribonucleic acid done clear
  View Solution play_arrow

• question_answer85)
  Which one of the following peak absorption of ultraviolet light by heterocyclic bases (Nitrogen bases) [BHU 2000]
  A)
  1500 nm done clear
  B)
  26 nm done clear
  C)
  75 nm done clear
  D)
  260 nm done clear
  View Solution play_arrow

• question_answer86)
  The enzyme that breaks \[{{H}_{2}}\] bonds in DNA is [Kerala CET 2002]
  A)
  Helicase done clear
  B)
  Topoisomerase done clear
  C)
  Ligase done clear
  D)
  Polymerase done clear
  View Solution play_arrow

• question_answer87)
  Exon part of m-RNAs has code for [CBSE PMT 2002]
  A)
  Protein done clear
  B)
  Lipid done clear
  C)
  Phospholipid done clear
  D)
  Carbohydrate done clear
  View Solution play_arrow

• question_answer88)
  It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for genetic material. This is written by [Kerala CET 2003]
  A)
  Meselson and Stahl done clear
  B)
  Archibold Garrod done clear
  C)
  Severo Ochoa done clear
  D)
  Watson and Crick done clear
  View Solution play_arrow

• question_answer89)
  Eukaryotic RNA polymerase III catalyse the synthesis of [Kerala CET 2003]
  A)
  m RNA done clear
  B)
  t RNA done clear
  C)
  18.5 rRNA done clear
  D)
  Introns done clear
  View Solution play_arrow

• question_answer90)
  The specific DNA sequence where Eco R1 cuts is  [Kerala CET  2003; Orissa JEE 2004]
  A)
  \[\underset{\text{TAAGCT}}{\mathop{\text{ATTCGA}}}\,\]. done clear
  B)
  \[\underset{\text{CTTAAG}}{\mathop{\text{GAATTC}}}\,\] done clear
  C)
  \[\begin{align}   & GCTTAA \\  & CGAATT \\ \end{align}\] done clear
  D)
  \[\begin{align}   & GTTCAA \\  & CAAGTT \\ \end{align}\] done clear
  View Solution play_arrow

• question_answer91)
  The enzyme DNA polymerase was discovered by [Kerala CET 2003]
  A)
  Kornberg done clear
  B)
  Okazaki done clear
  C)
  Waston and Crick done clear
  D)
  Jacob and Monod done clear
  View Solution play_arrow

• question_answer92)
  What is false about t RNA [AIIMS 2003]
  A)
  It binds with an amino acid at it 5' end done clear
  B)
  It has five double stranded regions done clear
  C)
  It has a codon at one end which recognizes the anticodon on messenger RNA done clear
  D)
  It looks like clover leaf in the three dimensional structure done clear
  View Solution play_arrow

• question_answer93)
  c-DNA can be formed by [DPMT 2003]
  A)
  Transaminase done clear
  B)
  DNA ligase done clear
  C)
  RNA dependent DNA polymerase done clear
  D)
  DNA dependent DNA polymerase done clear
  View Solution play_arrow

• question_answer94)
  Which of the following is not correct [DPMT 2003; Haryana PMT 2005]
  A)
  \[\frac{A}{T}=1\] done clear
  B)
  \[\text{A}+\text{T}=\text{G}+\text{C}\] done clear
  C)
  \[A+G=C+T\] done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer95)
  Which is not correctly matched [BHU 2003]
  A)
  Lipase - Hydrolysis of fats done clear
  B)
  Isomerases - Joining of similar substrate and management of substrate done clear
  C)
  Polymerase - Chain elongation done clear
  D)
  DNA ligase - Breaks DNA strand into two segments done clear
  View Solution play_arrow

• question_answer96)
  In a mutational event, when adenine is replaced by guanine, it is a case of [CBSE PMT 2004]
  A)
  Transition done clear
  B)
  Transversion done clear
  C)
  Frameshift mutation done clear
  D)
  Transcription done clear
  View Solution play_arrow

• question_answer97)
  During transcription, if the nucleotide sequence of the DNA strand that is being coded is ATACG; then the nucleotide sequence in the mRNA would be [CBSE PMT 2004]
  A)
  UAUGC done clear
  B)
  UATGC done clear
  C)
  TATGC done clear
  D)
  TCTGG done clear
  View Solution play_arrow

• question_answer98)
  During replication of a bacterial chromosome DNA synthesis starts from a replication origin site and [CBSE PMT 2004]
  A)
  Moves in one direction of the site done clear
  B)
  Moves in bi-directional way done clear
  C)
  RNA primers are involved done clear
  D)
  Is facilitated by tolemerase done clear
  View Solution play_arrow

• question_answer99)
  Which form of RNA has a structure resembling clover leaf [CBSE PMT 2004]
  A)
  RNA done clear
  B)
   RNA done clear
  C)
  \[r\]RNA done clear
  D)
  \[hn\] RNA done clear
  View Solution play_arrow

• question_answer100)
  A given double stranded DNA molecule is 1,00,000 base pairs long. The length of this DNA molecule will be
  A)
  10,000 nm done clear
  B)
  done clear
  C)
  \[{{10}^{4}}nm\] done clear
  D)
  2, 00, 000 nm done clear
  View Solution play_arrow

• question_answer101)
  DNA repairing is done by [BHU 1985; Kerala CET 2002;  AFMC 2004; Orissa JEE 2004]
  A)
  Ligase done clear
  B)
  DNA polymerase III done clear
  C)
  DNA polymerase II done clear
  D)
  DNA polymerase I done clear
  View Solution play_arrow

• question_answer102)
  Transforming principle in Griffith's experiment was DNA. It was discovered by [MH-CET 2004]
  A)
  Zinder and Lederberg done clear
  B)
  Avery, McLeod and McCarthy done clear
  C)
  Lederberg and Tatum done clear
  D)
  Zinder and Tatum done clear
  View Solution play_arrow

• question_answer103)
  Synthesis of RNA is [MHCET 2004]
  A)
  Transcription done clear
  B)
  Translation done clear
  C)
  Translocation done clear
  D)
  Transduction done clear
  View Solution play_arrow

• question_answer104)
  The bacterium used in Griffith's experiment was [MHCET 2004]
  A)
  Bacillus done clear
  B)
  Monococcus done clear
  C)
  Diplococcus done clear
  D)
  Spirillum done clear
  View Solution play_arrow

• question_answer105)
  Which RNA carries information from DNA in protein synthesis [BVP 2000]
  A)
  s-RNA done clear
  B)
  t-RNA done clear
  C)
  r-RNA done clear
  D)
  m-RNA done clear
  View Solution play_arrow

• question_answer106)
  New strand on a DNA template is initiated by [MHCET 2002]
  A)
  RNA polymerase done clear
  B)
  DNA polymerase done clear
  C)
  DNA ligase done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer107)
  During DNA replication, the strands separate by [MHCET 2002]
  A)
  DNA polymerase done clear
  B)
  Unwindase done clear
  C)
  Gyrase done clear
  D)
  Topoisomerase done clear
  View Solution play_arrow

• question_answer108)
  In a given DNA segment the number of nucleotides of guanine is 75 and those of thymine is 75. The total number of nucleotides in the segment will be [MHCET 2002]
  A)
  75 done clear
  B)
  750 done clear
  C)
  225 done clear
  D)
  300 done clear
  View Solution play_arrow

• question_answer109)
  There are special proteins that help to open up DNA double helix in front of the replication fork. These protein are  [MHCET 2003]
  A)
  DNA ligase done clear
  B)
  DNA gyrase done clear
  C)
  DNA polymerase I done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer110)
  In a hair pin model of RNA which nitrogen base is present at the short end [MHCET 2002]
  A)
  Adenine done clear
  B)
  Guanine done clear
  C)
  Thymine done clear
  D)
  Cytosine done clear
  View Solution play_arrow

• question_answer111)
  Which of the following is not found in DNA [CPMT 2005]
  A)
  Adenine done clear
  B)
  Cytosine done clear
  C)
  Uracil done clear
  D)
  Thymine done clear
  View Solution play_arrow

• question_answer112)
  Choose the correct statement about the direction of DNA strand [MHCET 2004; BVP 2004]
  A)
  5? ® 3? takes place on template strand done clear
  B)
  3? ® 5? takes place on new strand done clear
  C)
  5? ® 3? takes place on leading strand done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer113)
  Which one of the following hydrolyses internal phosphodiester, bonds in a polynucletide chain [CBSE PMT 2005]
  A)
  Lipase done clear
  B)
  Exonuclease done clear
  C)
  Endonuclease done clear
  D)
  Protease done clear
  View Solution play_arrow

• question_answer114)
  Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by [CPMT 1992; AIIMS 1993; MP PMT 2000; BVP 2001; CBSE PMT 2005]
  A)
  (Base-sugar-phosphate)n done clear
  B)
  Base-sugar-OH done clear
  C)
  Base-sugar-phosphate done clear
  D)
  Sugar-phosphate done clear
  View Solution play_arrow

• question_answer115)
  Which one of the following makes use of RNA as a template to synthesize DNA [CBSE PMT 2005]
  A)
  Reverse transcriptase done clear
  B)
  DNA dependant RNA polymerase done clear
  C)
  DNA polymerase done clear
  D)
  RNA polymerase done clear
  View Solution play_arrow

• question_answer116)
  Which is the hereditary material in bacteria [BCECE 2005]
  A)
  Nucleic acid done clear
  B)
  Nucleic acid and cytoplasm done clear
  C)
  Nucleic acid and Histone done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer117)
  Unit of nucleic acid is [BCECE 2005]
  A)
  Nucleotide done clear
  B)
  Nucleoside done clear
  C)
  Nucleic acid done clear
  D)
  All done clear
  View Solution play_arrow

• question_answer118)
  Messenger RNA is produced in [CPMT 2005]
  A)
  Nucleus done clear
  B)
  Golgi apparatus done clear
  C)
  Endoplasmic reticulum done clear
  D)
  Ribosomes done clear
  View Solution play_arrow

• question_answer119)
  Which is soluble RNA [CPMT 2005]
  A)
  hnRNA done clear
  B)
  rRNA done clear
  C)
  mRNA done clear
  D)
  tRNA done clear
  View Solution play_arrow

• question_answer120)
  Genetic information transfer nucleus to cytoplasm by [MP PMT 2005]
  A)
  DNA done clear
  B)
  RNA done clear
  C)
  Lysosome done clear
  D)
  All done clear
  View Solution play_arrow

• question_answer121)
  Supercoiled DNA can be traced in [Wardha 2005]
  A)
  Prokaryotes and eukaryotes done clear
  B)
  Eukaryotes only done clear
  C)
  Prokaryotes only done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer122)
  DNA is double helix and [Wardha 2005]
  A)
  Complementary and parallel done clear
  B)
  Complementary and antiparallel done clear
  C)
  Without super coils done clear
  D)
  Always circular done clear
  View Solution play_arrow

• question_answer123)
  Degeneration of DNA after heating can be studied by comparing [Wardha 2005]
  A)
  A : T ratio done clear
  B)
  G : C ratio done clear
  C)
  Sugar : Phosphate done clear
  D)
  Number of nucleotides done clear
  View Solution play_arrow

• question_answer124)
  What is Okazaki segment
  A)
  DNA segment concerning recombination done clear
  B)
  Nucleotide chain segment formed during transcription done clear
  C)
  Nucleotide chain formed during DNA duplication done clear
  D)
  Segment of gene responsible for recombination done clear
  View Solution play_arrow

• question_answer125)
  Complementary DNA  (cDNA) is complementary to
  A)
  mRNA done clear
  B)
  tRNA done clear
  C)
  rRNA done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer126)
  The function of  tRNA is [CPMT 1988]
  A)
  Production of mRNA done clear
  B)
  Production of ribosomes done clear
  C)
  Production of microsomes done clear
  D)
  Selection of amino acids done clear
  View Solution play_arrow

• question_answer127)
  What are informosomes
  A)
  They are special types of tRNA done clear
  B)
  They are more stable forms of eukaryotic mRNA done clear
  C)
  They are eukaryotic rRNA done clear
  D)
  Both (b) and (c) done clear
  View Solution play_arrow

• question_answer128)
  Heterogenous nuclear RNA
  A)
  Has lesser number of nucleotides done clear
  B)
  Has at least 50 nucleotides done clear
  C)
  Has about 100 nucleotides done clear
  D)
  Has about 200 or more nucleotides done clear
  View Solution play_arrow

• question_answer129)
  Larger sub-unit of ribosome is composed of how many rRNA molecules
  A)
  One done clear
  B)
  Two done clear
  C)
  Three done clear
  D)
  Four done clear
  View Solution play_arrow

• question_answer130)
  The contribution of cytoplasmic DNA in cells to total DNA is [DPMT 1986]
  A)
  1 to 5% done clear
  B)
  45 to 50% done clear
  C)
  65 to 75% done clear
  D)
  95 to 99% done clear
  View Solution play_arrow

• question_answer131)
  The base sequence for a nucleic acid segment is given CAG, AGG, CGA, CCA. From this, it can definitely be concluded that it is a segment of [AIIMS 1983]
  A)
  DNA strand done clear
  B)
  mRNA strand done clear
  C)
  tRNA strand done clear
  D)
  Data not sufficient done clear
  View Solution play_arrow

• question_answer132)
  The eukaryotic genome differs from the prokaryotic genome because [CBSE PMT 1999]
  A)
  Repetitive sequences are present in eukaryotes done clear
  B)
  Genes in the former case are organized into operons done clear
  C)
  The DNA is complexed with histones in prokaryotes done clear
  D)
  The DNA is circular and single stranded in prokaryotes done clear
  View Solution play_arrow

• question_answer133)
  The double helix model of Watson and Crick is known as [CPMT 2004]
  A)
  C-DNA done clear
  B)
  B-DNA done clear
  C)
  Z-DNA done clear
  D)
  D-DNA done clear
  View Solution play_arrow