Solved papers for NEET Chemistry NEET PYQ-Biomolecules

done NEET PYQ-Biomolecules Total Questions - 56

• question_answer1) Glucose molecule reacts with \['X'\] number of molecules of phenylhydrazine to yield osazone. The value of \['X'\] is:                   [AIPMT 1998]
  A)
  four
  done clear
  B)
  one
  done clear
  C)
  two
  done clear
  D)
  three
  done clear
  View Answer play_arrow

• question_answer2) Which of the following is the sweetest sugar? [AIPMT 1999]
  A)
  Sucrose
  done clear
  B)
  Glucose
  done clear
  C)
  Fructose
  done clear
  D)
  Maltose
  done clear
  View Answer play_arrow

• question_answer3) Which one of the following has magnesium? [AIPMT 2000]
  A)
  Vitamin \[{{B}_{12}}\]
  done clear
  B)
  Chlorophyll                   
  done clear
  C)
  Haemocyanin    
  done clear
  D)
  Carbonic anhydrase
  done clear
  View Answer play_arrow

• question_answer4) \[\alpha -D(+)\]-glucose and \[\beta -D(+)\]-glucose are: [AIPMT 2000]
  A)
  anomers
  done clear
  B)
                   epimers 
  done clear
  C)
  enantiomers      
  done clear
  D)
  geometrical isomers
  done clear
  View Answer play_arrow

• question_answer5) The hormone which controls the processes like burning of fats, proteins and carbohydrates to liberate energy in the body is:     [AIPMT 2000]
  A)
  cortisone
  done clear
  B)
  thyroxine
  done clear
  C)
  adrenaline
  done clear
  D)
  insulin
  done clear
  View Answer play_arrow

• question_answer6) Which of the following colligative property can provide molar mass of proteins (or polymers or colloids) with greatest precision?  [AIPMT 2000]
  A)
  Osmotic pressure
  done clear
  B)
  Elevation of boiling point
  done clear
  C)
  Depression of freezing point         
  done clear
  D)
  Relative lowering of vapour pressure
  done clear
  View Answer play_arrow

• question_answer7) Which one of the following gives positive Fehling's solution test?                   [AIPMT 2001]
  A)
  Sucrose
  done clear
  B)
  Glucose
  done clear
  C)
  Fats
  done clear
  D)
  Protein
  done clear
  View Answer play_arrow

• question_answer8) Which of the following is correct about H-bonding in nucleotide?                              [AIPMT 2001]
  A)
  A-T, G-C
  done clear
  B)
  A-G, T-C
  done clear
  C)
  G-T, A-C
  done clear
  D)
  A-A, T-T
  done clear
  View Answer play_arrow

• question_answer9) Which of the following is correct statement? [AIPMT 2001]
  A)
  Starch is polymer of \[\alpha \]-glucose
  done clear
  B)
  Amylose is a component of cellulose
  done clear
  C)
  Protiens are composed of only one type of amino acid
  done clear
  D)
  In cyclic structure of fructose, there are four carbons and one oxygen atom
  done clear
  View Answer play_arrow

• question_answer10) Which statement is incorrect about peptide bond\[-\overset{\begin{smallmatrix}  O \\  |\,\,| \end{smallmatrix}}{\mathop{C}}\,-\overset{\centerdot \,\,\centerdot }{\mathop{NH}}\,-\]?                          [AIPMT 2001]
  A)
  \[C-N\] bond length in proteins is longer than usual bond length of N-bond
  done clear
  B)
  Spectroscopic analysis show planar structure of \[-C-\underset{\begin{smallmatrix}  |\,\,\,| \\  O \end{smallmatrix}}{\mathop{NH}}\,-\] group
  done clear
  C)
  \[C-N\] bond length in proteins is smaller than usual bond length of \[C-N\] bond
  done clear
  D)
  None of the above
  done clear
  View Answer play_arrow

• question_answer11) Cellulose is polymer of:               [AIPMT 2002]
  A)
  glucose
  done clear
  B)
  fructose
  done clear
  C)
  ribose
  done clear
  D)
  sucrose 
  done clear
  View Answer play_arrow

• question_answer12) Enzymes are made up of:         [AIPMT 2002]
  A)
  edible proteins                           
  done clear
  B)
  proteins with specific structure
  done clear
  C)
  nitrogen containing carbohydrates
  done clear
  D)
  carbohydrates
  done clear
  View Answer play_arrow

• question_answer13) Which is not true statement?       [AIPMT 2002]
  A)
  \[\alpha \]-carbon of \[\alpha \]-amino acid is asymmetric
  done clear
  B)
  All proteins are found in L-form
  done clear
  C)
  Human body can synthesize all proteins they need
  done clear
  D)
  At \[pH=7\]both amino and carboxylic groups exist in ionised form
  done clear
  View Answer play_arrow

• question_answer14) Vitamin \[{{B}_{12}}\] contains:            [AIPMT 2003]
  A)
  Zn (II)
  done clear
  B)
  Ca (II)
  done clear
  C)
  Fe (II)
  done clear
  D)
  Co (III)
  done clear
  View Answer play_arrow

• question_answer15) Phospholipids are esters of glycerol with: [AIPMT 2003]
  A)
  one carboxylic acid residue and two phosphate groups
  done clear
  B)
  three phoshate groups
  done clear
  C)
  three carboxylic acid residues
  done clear
  D)
  two carboxylic acid residues and one phosphate groups
  done clear
  View Answer play_arrow

• question_answer16) Glycolysis is:                             [AIPMT 2003]
  A)
  oxidation of glucose to pyruvate  
  done clear
  B)
  conversion of glucose to haem
  done clear
  C)
  oxidation of glucose to glutamate 
  done clear
  D)
  conversion of pyruvate to citrate
  done clear
  View Answer play_arrow

• question_answer17) Chargaffs rule states that in an organism: [AIPMT 2003]
  A)
  amount of adenine is equal to that of cytosine and die amount of thymine (T) is equal to that of guanine (G)
  done clear
  B)
  amounts of all bases are equal
  done clear
  C)
  amount of adenine is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine
  done clear
  D)
  amount of adenine is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine
  done clear
  View Answer play_arrow

• question_answer18) Which one of the following structures represents the peptide chain?               [AIPMT (S) 2004]
  A)
   
  done clear
  B)
   
  done clear
  C)
   
  done clear
  D)
   
  done clear
  View Answer play_arrow

• question_answer19) A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid? [AIPMT (S) 2004]
  A)
  Three
  done clear
  B)
  Four     
  done clear
  C)
  One     
  done clear
  D)
  Two
  done clear
  View Answer play_arrow

• question_answer20) The hormone that helps in the conversion of glucose to glycogen is:       [AIPMT (S) 2004]
  A)
  cortisone
  done clear
  B)
  bile acids
  done clear
  C)
  adrenaline
  done clear
  D)
  insulin
  done clear
  View Answer play_arrow

• question_answer21) The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called: [AIPMT (S) 2004]
  A)
  maltase
  done clear
  B)
  lipase
  done clear
  C)
  zymase
  done clear
  D)
  pepsin
  done clear
  View Answer play_arrow

• question_answer22) The rapid change of pH near the stoichiometric point of an acid base titration is the basis of indicator detection. pH of the solution is related to ratio of the concentrations of the conjugate acid \[(HIn)\]and base \[(I{{n}^{-}})\]forms of the indicator given by the expression:         [AIPMT (S) 2004]
  A)
  \[\log \frac{[I{{n}^{-1}}]}{[\text{HIn}]}=p{{k}_{\ln }}-pH\]
  done clear
  B)
  \[\log \frac{[\text{Hn}]}{[I{{n}^{-}}]}=p{{k}_{In}}-pH\]
  done clear
  C)
  \[\log \frac{[HIn]}{[I{{n}^{-}}]}=pH-p{{K}_{\ln }}\]
  done clear
  D)
  None of these
  done clear
  View Answer play_arrow

• question_answer23) The correct statement in respect of protein hemoglobin is that it:             [AIPMT (S) 2004]
  A)
  functions as a catalyst for biological reactions
  done clear
  B)
  maintains blood sugar level
  done clear
  C)
  act as an oxygen carrier in the blood
  done clear
  D)
  forms antibodies and offers resistance to diseases
  done clear
  View Answer play_arrow

• question_answer24) Number of chiral carbon  atoms   in \[\beta -D+\]glucose is:                 [AIPMT (S) 2004]
  A)
  five
  done clear
  B)
  six       
  done clear
  C)
  three
  done clear
  D)
  four
  done clear
  View Answer play_arrow

• question_answer25) The helical structure of protein is stabilized by                                      [AIPMT (S) 2004]
  A)
  dipeptide bonds
  done clear
  B)
  hydrogen bonds
  done clear
  C)
  ether bonds
  done clear
  D)
  peptide bonds
  done clear
  View Answer play_arrow

• question_answer26) The cell membranes are mainly composed of:                                      [AIPMT (S) 2005]
  A)
  carbohydrates
  done clear
  B)
  proteins
  done clear
  C)
  phospholipids
  done clear
  D)
  fats
  done clear
  View Answer play_arrow

• question_answer27) Which functional group -participates in disulphide bond formation in proteins?  [AIPMT (S) 2005]
  A)
  Thiolactone
  done clear
  B)
  Thiol
  done clear
  C)
  Thioether
  done clear
  D)
  Thioester
  done clear
  View Answer play_arrow

• question_answer28) 

  During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process

  Proteins    \[\xrightarrow{Enzyme\,\,(A)}\]Polypeptides \[\xrightarrow{Enzyme\,(B)}\,\text{Amino}\,\text{acids},\]            are respectively:       [AIPMT (S) 2006]

  A)
  amylase and maltase                  
  done clear
  B)
  diastase and lipase
  done clear
  C)
  pepsin and trypsin                      
  done clear
  D)
  invertase and zymase
  done clear
  View Answer play_arrow

• question_answer29) The human body does not produce:                                                  [AIPMT (S) 2006]
  A)
  DNA
  done clear
  B)
  vitamins
  done clear
  C)
  hormones
  done clear
  D)
  enzymes
  done clear
  View Answer play_arrow

• question_answer30) Which one of the following is a peptide hormone? [AIPMT (S) 2006]
  A)
  Glucagon
  done clear
  B)
  Testosterone
  done clear
  C)
  Thyroxin
  done clear
  D)
  Adrenaline
  done clear
  View Answer play_arrow

• question_answer31) Which one of the following vitamins is water-soluble?                                        [AIPMT (S) 2007]
  A)
  Vitamin-B
  done clear
  B)
  Vitamin-E
  done clear
  C)
  Vitamin-K
  done clear
  D)
  Vitamin-A
  done clear
  View Answer play_arrow

• question_answer32) RNA and DNA are chiral molecules, their chirality is due to:                  [AIPMT (S) 2007]
  A)
  L-sugar component
  done clear
  B)
  chiral bases
  done clear
  C)
  chiral phosphate ester units                      
  done clear
  D)
  D-sugar component
  done clear
  View Answer play_arrow

• question_answer33) Which one of the following is an amine hormone? [AIPMT (S) 2008]
  A)
  Thyroxine
  done clear
  B)
  Oxypurin
  done clear
  C)
  Insulin
  done clear
  D)
  Progesterone
  done clear
  View Answer play_arrow

• question_answer34) In DNA, the complimentary bases are [AIPMT (S) 2008]
  A)
  Adenine and thymine; guanine and cytosine
  done clear
  B)
  Adenine and thymine; guanine and uracil
  done clear
  C)
  Adenine and guanine, thymine and cytosine
  done clear
  D)
  Uracil and adenine; cytosine and guanine
  done clear
  View Answer play_arrow

• question_answer35) The segment of DNA, which acts as the instrumental manual for the synthesis of the protein is [AIPMT (S) 2009]
  A)
  nucleotide
  done clear
  B)
  ribose
  done clear
  C)
  gene
  done clear
  D)
  nucleoside
  done clear
  View Answer play_arrow

• question_answer36) Which of the following hormones contains iodine?                    [AIPMT (S) 2009]
  A)
  Insulin
  done clear
  B)
  Testosterone
  done clear
  C)
  Adrenaline
  done clear
  D)
  Thyroxine 
  done clear
  View Answer play_arrow

• question_answer37) Which one of the following does not exhibit the phenomenon of mutarotation?            [AIPMT (S) 2010]
  A)
  (+) Sucrose
  done clear
  B)
  (+) Lactose       
  done clear
  C)
  (+) Maltose
  done clear
  D)
  (-) Fructose
  done clear
  View Answer play_arrow

• question_answer38) Which one of the following is employed as a tranquilizer drug?               [AIPMT (S) 2010]
  A)
  Promethazine
  done clear
  B)
  Valium
  done clear
  C)
  Naproxen
  done clear
  D)
  Mifepristone
  done clear
  View Answer play_arrow

• question_answer39) Which one of the following statements is not true regarding (+) lactose?              [AIPMT (S) 2011]
  A)
  (+) lactose is a \[\text{ }\!\!\beta\!\!\text{ -}\]glycoside formed by the union of a molecule of D(+) glucose and a molecule of D(+) galactose
  done clear
  B)
  (+) lactose is a reducing sugar and does not exhibit mutarotation
  done clear
  C)
  (+) lactose,\[{{C}_{12}}{{H}_{22}}{{O}_{11}}\]contains 8-OH groups
  done clear
  D)
  On hydrolysis (+) lactose gives equal amount of D (+) glucose and D (+) galactose
  done clear
  View Answer play_arrow

• question_answer40) Which of the following is not a fat soluble vitamin? [AIPMT (M) 2011]
  A)
  Vitamin-B complex
  done clear
  B)
  Vitamin-D
  done clear
  C)
  Vitamin-E
  done clear
  D)
  Vitamin-A
  done clear
  View Answer play_arrow

• question_answer41) 

  Which of the statements about 'Denaturation' given below are correct?

  Statements

  Denaturation of proteins causes loss of secondary and tertiary structures of the protein.

  Denaturation leads to the conversion of double strand of DNA into single strand. [AIPMT (M) 2011]

  Denaturation affects primary structure which gets distroyed.

  A)
  and
  done clear
  B)
  and
  done clear
  C)
  and
  done clear
  D)
  , and
  done clear
  View Answer play_arrow

• question_answer42) Which one of the following statements is incorrect about enzyme catalysis?          [AIPMT (S) 2012]
  A)
  Enzymes are mostly protein us in nature
  done clear
  B)
  Enzyme action is specific
  done clear
  C)
  Enzymes are denaturized by ultraviolet rays and at high temperature
  done clear
  D)
  Enzymes are least reactive at optimum temperature
  done clear
  View Answer play_arrow

• question_answer43) Deficiency of vitamin B1 causes the disease                           [AIPMT (S) 2012]
  A)
  convulsions
  done clear
  B)
  beri-beri
  done clear
  C)
  cheilosis
  done clear
  D)
  sterility
  done clear
  View Answer play_arrow

• question_answer44) Which one of the following sets of monosaccharide’s forms sucrose? [AIPMT (S) 2012]
  A)
  \[\text{ }\!\!\alpha\!\!\text{ -}\]D-galactopyranose and \[\text{ }\!\!\alpha\!\!\text{ -}\]D-glucopyranose
  done clear
  B)
  \[\text{ }\!\!\alpha\!\!\text{ -}\]D-glucopyranose and \[\text{ }\!\!\beta\!\!\text{ -}\]D-fructofuranose
  done clear
  C)
  \[\text{ }\!\!\beta\!\!\text{ -}\]D-glucopyranose and \[\text{ }\!\!\alpha\!\!\text{ -}\]D-fructofuranose
  done clear
  D)
  \[\text{ }\!\!\alpha\!\!\text{ -}\]D-glucopyranose and \[\text{ }\!\!\beta\!\!\text{ -}\]D-fructopyranose
  done clear
  View Answer play_arrow

• question_answer45) D-(+)-glucose reacts with hydroxyl amine and yields an oxime. The structure of the oxime would be [AIPMT 2014]
  A)
  
  done clear
  B)
   
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer46) Which of the following hormones is produced under the condition of stress which stimulates glycogenolysis in the liver of human beings? [AIPMT 2014]
  A)
  Thyroxin
  done clear
  B)
  Insulin
  done clear
  C)
  Adrenaline
  done clear
  D)
  Estradiol
  done clear
  View Answer play_arrow

• question_answer47) In a protein molecule various amino acids are  linked together by :               [NEET - 2016]
  A)
  \[\alpha -\] glycosidic bond
  done clear
  B)
  \[\beta -\]glycosidic bond
  done clear
  C)
  peptide bond
  done clear
  D)
  dative bond
  done clear
  View Answer play_arrow

• question_answer48) The correct statement regarding RNA and  DNA, respectively is :                 [NEET - 2016]
  A)
  The sugar component in RNA is arabinose and the sugar component in DNA is 2'-deoxyribose.
  done clear
  B)
  The sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose.
  done clear
  C)
  The sugar component in RNA is arabinose
  done clear
  D)
  The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose.
  done clear
  View Answer play_arrow

• question_answer49) Which of the following statements is not correct? [NEET-2017]
  A)
  Denaturation makes the proteins more active
  done clear
  B)
  Insulin maintains sugar level in the blood of a human body
  done clear
  C)
  Ovalbumin is a simple food reserve in egg-white
  done clear
  D)
  Blood proteins thrombin and fibrinogen are involved in blood clotting
  done clear
  View Answer play_arrow

• question_answer50) Which of the following compounds can form a zwitterion?                          [NEET - 2018]
  A)
  Benzoic acid
  done clear
  B)
  Acetanilide
  done clear
  C)
  Aniline
  done clear
  D)
  Glycine
  done clear
  View Answer play_arrow

• question_answer51) The difference between amylose and amylopectin is                                     [NEET - 2018]
  A)
  Amylopectin have 1\[\to \]4 \[\alpha \]-linkage and 1\[\to \]6 \[\beta \]-linkage
  done clear
  B)
  Amylose have 1\[\to \]4 \[\alpha \]-linkage and 1\[\to \]6 \[\beta \]-linkage
  done clear
  C)
  Amylopectin have 1\[\to \]4 \[\alpha \]-linkage and 1\[\to \]6\[\alpha \]-linkage
  done clear
  D)
  Amylose is made up of glucose and galactose
  done clear
  View Answer play_arrow

• question_answer52) Enzymes that utilize ATP is phosphate transfer require an alkaline earth metal (M) as the cofactor. M is-[NEET 2019]
  A)
  Ca
  done clear
  B)
  Sr
  done clear
  C)
  Be
  done clear
  D)
  Mg
  done clear
  View Answer play_arrow

• question_answer53) The non-essential amino acid among the following is:                                    [NEET 2019]
  A)
  Alanine
  done clear
  B)
  lysine
  done clear
  C)
  Valine
  done clear
  D)
  leucine
  done clear
  View Answer play_arrow

• question_answer54) Sucrose on hydrolysis gives          [NEET 2020]
  A)
  (a \[\alpha -D-Glucose+\beta -D-Glucose\]
  done clear
  B)
  \[\alpha -D-Glucose+\beta -D-Fructose\]
  done clear
  C)
  \[\alpha -D-Fructose\text{ }+\beta -D-Fructose\]
  done clear
  D)
  \[\alpha -D-Glucose+\beta -D-Fructose\]
  done clear
  View Answer play_arrow

• question_answer55) The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals.      [NEET 2020]
  A)
  Copper
  done clear
  B)
  Calcium
  done clear
  C)
  Potassium
  done clear
  D)
  Iron
  done clear
  View Answer play_arrow

• question_answer56) Which of the following is a basic amino acid? [NEET 2020]
  A)
  Alanine
  done clear
  B)
  Tyrosine
  done clear
  C)
  Lysine
  done clear
  D)
  Serine
  done clear
  View Answer play_arrow