NEET Chemistry Biomolecules / जैव-अणु Question Bank

done Self Evaluation Test - Biomolecules Total Questions - 60

• question_answer1)
  In fructose, the possible optical isomers are
  A)
  12                     done clear
  B)
  8     done clear
  C)
  16                                 done clear
  D)
  4 done clear
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• question_answer2)
  Glucose molecule reacts with X number of molecules of phenylhydrazine to yield osazone. The value of X is
  A)
  three                 done clear
  B)
  two  done clear
  C)
  one                               done clear
  D)
  four done clear
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• question_answer3)
  Which L-sugar on oxidation gives an optically active dibasic acid (2 COOH groups)?
  A)
    done clear
  B)
  done clear
  C)
     done clear
  D)
  done clear
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• question_answer4)
  In cells the net production of ATP molecules generated from one glucose molecule is
  A)
  46                     done clear
  B)
  32    done clear
  C)
  36         done clear
  D)
  40 done clear
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• question_answer5)
  Which is correct statement?
  A)
  Starch is a polymer of \[\alpha \]-glucose done clear
  B)
  In cyclic structure of fructose, there are four carbons and one oxygen atom done clear
  C)
  Amylose is a component of cellulose done clear
  D)
  Proteins are composed of only one type of amino acids done clear
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• question_answer6)
  Vitamin D is also known as
  A)
  sunshine vitamin done clear
  B)
  ascorbic acid done clear
  C)
  growth vitamin done clear
  D)
  reproductive vitamin done clear
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• question_answer7)
  Night blindness is caused by deficiency of
  A)
  vitamin \[{{B}_{12}}\]               done clear
  B)
  vitamin A done clear
  C)
  vitamin C          done clear
  D)
  vitamin E done clear
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• question_answer8)
  The hormone which controls the processes of burning of fats, proteins and carbohydrates to liberate energy in the body is
  A)
  cortisone            done clear
  B)
  adrenaline done clear
  C)
  thyroxine           done clear
  D)
  insulin done clear
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• question_answer9)
  Two vitamins absorbed from intestine along with fast are
  A)
  A, D                  done clear
  B)
  A, B done clear
  C)
  A, C                              done clear
  D)
  D, B done clear
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• question_answer10)
  Which one of the following is an amine hormone?
  A)
  Thyroxine          done clear
  B)
  Oxypurin done clear
  C)
  Insulin                           done clear
  D)
  Progesterone done clear
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• question_answer11)
  Complete hydrolysis of starch gives:
  A)
  glucose only done clear
  B)
  galactose and fructose in equimolar amounts done clear
  C)
  glucose and galactose in equimolar amounts done clear
  D)
  glucose and fructose in equimolar amounts done clear
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• question_answer12)
  Accumulation of which of the following molecules in the muscles occurs as a result of vigorous exercise?
  A)
  Glycogen           done clear
  B)
  Glucose done clear
  C)
  Pyruvic acid      done clear
  D)
  L-lactic acid done clear
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• question_answer13)
  Which of the following will not show mutarotation?
  A)
  Maltose             done clear
  B)
  Lactose done clear
  C)
  Glucose             done clear
  D)
  Sucrose done clear
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• question_answer14)
  An organic compound with the formula \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\]forms a yellow crystalline solid with phenylhydrazine and gives a mixture of sorbitol and mannitol when reduced with sodium. Which among the following could be the compound?
  A)
  fructose  done clear
  B)
  glucose done clear
  C)
  mannose            done clear
  D)
  sucrose done clear
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• question_answer15)
  When \[\alpha \]-D-glucose and \[\beta \]-D-glucose are dissolved in water in two separate beakers I and II respectively and allowed to stand, then -
  A)
  specific rotation in beaker I will decrease while in II will increase upto a constant value done clear
  B)
  the specific rotation of equilibrium mixture in two beakers will be different done clear
  C)
  the equilibrium mixture in both beakers will be leavorotatory done clear
  D)
  the equilibrium mixture in both beakers will contain only cyclic form of glucose done clear
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• question_answer16)
  The \[p{{K}_{4}}\] values for the three ionizable groups X, Y and Z of glutamic acid are 4.3, 9.7 and 2.2 respectively \[\underset{X}{\mathop{H{{O}_{2}}C}}\,-C{{H}_{2}}-\underset{Y}{\mathop{\underset{_{+}N{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,H}}\,-\underset{Z}{\mathop{C{{O}_{2}}H}}\,\] The isoelectric point for the amino acid is:
  A)
  7.00                  done clear
  B)
  3.25   done clear
  C)
  4.95                  done clear
  D)
  5.95 done clear
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• question_answer17)
  A vitamin that contains both N and P is
  A)
  Vitamin C          done clear
  B)
  Vitamin K done clear
  C)
  Vitamin \[{{B}_{12}}\]              done clear
  D)
  Vitamin D done clear
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• question_answer18)
  Match List I (name of vitamin) with List II (deficiency result/disease) and select the correct answer using the codes given below the lists:

  List I	List II
  I. Ascorbic acid	A. Beri-beri
  II. Retinol	B. Cracked lips
  III. Riboflavin	C. Scurvy
  IV. Thiamine	D. Night blindness

  A)
  I-B,       II-A,      III-C,     IV-D done clear
  B)
  I-A,       II-B,      III-C,     IV-D done clear
  C)
  I-D,       II-C,      III-B,     IV-A done clear
  D)
  I-C,       II-D,      III-B,     IV-A done clear
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• question_answer19)
  Nucleotides in DNA are linked by -
  A)
  hydrogen bond done clear
  B)
  3', 5'-phosphodiester bond done clear
  C)
  glycosidic bond done clear
  D)
  peptide bond done clear
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• question_answer20)
  If one strand of DNA has the sequence ATGCTTGA, the sequence in the complimentary strand would be
  A)
  TACGAACT      done clear
  B)
  TCCGAACT done clear
  C)
  TACGTACT       done clear
  D)
  TACGTAGT done clear
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• question_answer21)
  Which of the following pairs can be distinguished by Fehling's solution?
  A)
  Glucose and fructose                    done clear
  B)
  Glucose and sucrose done clear
  C)
  Methanal and ethanol done clear
  D)
  Hydroxypropanone and benzaldehyde. done clear
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• question_answer22)
  Which of the following statement(s) is (are) true?

  (i) All amino acids contain one chiral center.

  (ii) Some amino acids contain one, while some contain more chiral center or even no chiral center.

  (iii) All amino acids found in proteins have L configuration.

  (iv) All amino acids found in proteins have \[1{}^\circ \] amino group.

  A)
  (ii), (iii) & (iv)      done clear
  B)
  (ii) & (iii) done clear
  C)
  (i), (iii) & (iv)                  done clear
  D)
  (i) & (iv). done clear
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• question_answer23)
  In osazone formation, glucose reacts with three molecules of phenylhydrazine. Which statement is true regarding this?      
  A)
  All the three molecules react in similar fashion done clear
  B)
  Two molecules react in similar manner, while the third reacts in different way done clear
  C)
  All the three molecules react in different ways done clear
  D)
  None of the above is true done clear
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• question_answer24)
  Natural glucose is termed D-glucose because:
  A)
  \[-OH\] on the second carbon is on the right side in Fischer projection done clear
  B)
  \[-OH\] on the sixth carbon is on the right side in Fischer projection. done clear
  C)
  \[-OH\] on the fifth carbon is on the right side in Fischer projection. done clear
  D)
  It is dextrorotatory. done clear
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• question_answer25)
  Which of the following statement is not correct?
  A)
  Amylopectin is a branched polymer of \[\alpha \]- glucose. done clear
  B)
  Cellulose is a linear polymer of \[\beta \]-glucose done clear
  C)
  Glycogen is the food reserve of plants done clear
  D)
  All proteins are polymers of \[\alpha \]- amino acids. done clear
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• question_answer26)
  Amylopectin is a polymer of
  A)
  \[\alpha -D\]-glucose        done clear
  B)
  amino acid done clear
  C)
  \[\beta -D\]- glucose         done clear
  D)
  amylase. done clear
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• question_answer27)
  Which of the following is a non-reducing sugar?
  A)
  Lactose             done clear
  B)
  Fructose done clear
  C)
  Sucrose             done clear
  D)
  Maltose done clear
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• question_answer28)
  Glycosidic linkage is actually an:
  A)
  Carbonyl bond   done clear
  B)
  Ether bond done clear
  C)
  Ester bond         done clear
  D)
  Amide bond done clear
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• question_answer29)
  Which of the following does not reduce Benedict's solution?
  A)
  Glucose             done clear
  B)
  Fructose done clear
  C)
  Sucrose             done clear
  D)
  Aldehyde done clear
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• question_answer30)
  Hydrolysis of sucrose is called
  A)
  hydration           done clear
  B)
  saponification done clear
  C)
  esterification       done clear
  D)
  inversion done clear
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• question_answer31)
  Assume that a particular amino acid has an isoelectric point of 6.0. In a solution at pH 1.0, which of the following species will predominate?
  A)
  \[{{H}_{3}}\overset{+}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}H\]   done clear
  B)
  \[{{H}_{2}}\overset{{}}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}H\] done clear
  C)
  \[{{H}_{3}}\overset{+}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}\]          done clear
  D)
  \[{{H}_{2}}\overset{{}}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HCO_{2}^{-}\] done clear
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• question_answer32)
  A mixture of two amino acids having pI 9.60 and 5.40 can be separated
  A)
  by adjusting the pH of the solution at 9.60 done clear
  B)
  by adjusting the pH of the solution at 4.20 done clear
  C)
  by adjusting the pH of the solution at 7.0 done clear
  D)
  by adjusting the pH of the solution at 7.5. done clear
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• question_answer33)
  The correct statement in respect of protein haemoglobin is that it
  A)
  acts as an oxygen carrier in the blood done clear
  B)
  forms antibodies and offers resistance to diseases done clear
  C)
  enzymes are specific biological catalysts that can normally function at very high temperature \[\left( T\tilde{\ }1000K \right)\] done clear
  D)
  enzymes are specific biological catalysts that possess well-defined active sites done clear
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• question_answer34)
  Which of the following carbohydrates is not related to (+)-glucose?
  A)
  Amylopectin       done clear
  B)
  Amylose done clear
  C)
  Inulin                            done clear
  D)
  Glycogen done clear
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• question_answer35)
  What will happen when D-(+)-glucose is treated with methanolic \[-HCl\] followed by Tollens' reagent?
  A)
  A black ppt. will be formed done clear
  B)
  A red ppt. will be formed done clear
  C)
  A green colour will appear done clear
  D)
  No characteristic colour or ppt. will be formed. done clear
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• question_answer36)
  Glucose-D has a great tendency to be converted into cyclic isomer. Which two carbon atoms get joined through 'O' to form this hemiacetal?
  A)
  \[{{C}_{1}}\] and \[{{C}_{4}}\]            done clear
  B)
  \[{{C}_{1}}\]and \[{{C}_{5}}\] done clear
  C)
  \[{{C}_{1}}\] and \[{{C}_{6}}\]            done clear
  D)
  \[{{C}_{2}}\] and \[{{C}_{6}}\] done clear
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• question_answer37)
  Among the three compounds shown below, two yield the same product on reaction with warm\[HN{{O}_{3}}\]. The exception is:
  A)
     done clear
  B)
  done clear
  C)
  done clear
  D)
  None of these done clear
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• question_answer38)
  The enantiomer of \[\alpha -D-\left( + \right)\]-glucose is
  A)
  \[\beta -D-\left( + \right)\]-glucose   done clear
  B)
  \[\alpha -D-\left( - \right)\] -glucose done clear
  C)
  \[\alpha -L-\left( - \right)\]-glucose   done clear
  D)
  \[\beta -L-\left( - \right)\]-glucose. done clear
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• question_answer39)

  Compounds I and II may be grouped as

  A)
  diastereomers    done clear
  B)
  epimers done clear
  C)
  C-2 epimers        done clear
  D)
  all of the three. done clear
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• question_answer40)
  Which of the following evolves carbon dioxide, on oxidation with periodate?
  A)
              done clear
  B)
    done clear
  C)
  Both                             done clear
  D)
  None done clear
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• question_answer41)
  Imino acid among these compounds is
  A)
  serine                            done clear
  B)
  proline done clear
  C)
  tyrosine                         done clear
  D)
  lysine done clear
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• question_answer42)
  Which amino acid is achiral?
  A)
  alanine              done clear
  B)
  valine done clear
  C)
  proline               done clear
  D)
  None of these done clear
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• question_answer43)
  Which is not a true statement?
  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 acids and carboxylic groups exist in the ionised form done clear
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• question_answer44)
  Which of the following is a steroid hormone?
  A)
  Cholesterol         done clear
  B)
  Adrenaline done clear
  C)
  Thyroxine          done clear
  D)
  Progesterone done clear
  View Solution play_arrow

• question_answer45)
  Vitamin \[{{B}_{6}}\] is known as
  A)
  pyridoxine          done clear
  B)
  thiamine done clear
  C)
  tocopherol          done clear
  D)
  riboflavin done clear
  View Solution play_arrow

• question_answer46)
  A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?
  A)
  Three                            done clear
  B)
  Four done clear
  C)
  One                              done clear
  D)
  Two done clear
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• question_answer47)
  The process by which synthesis of protein takes place based on the genetic information present in m-RNA is called
  A)
  Translation done clear
  B)
  Transcription done clear
  C)
  Replication done clear
  D)
  Messenger hypothesis done clear
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• question_answer48)
  Which of the following substances is not present in nucleic acids?
  A)
  Cytosine            done clear
  B)
  Adenine done clear
  C)
  Thymine            done clear
  D)
  Guanidine done clear
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• question_answer49)
  Which of the following is not present in a nucleotide?
  A)
  Guanine            done clear
  B)
  Cytosine done clear
  C)
  Adenine             done clear
  D)
  Tyrosine done clear
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• question_answer50)
  Iso-electric point of alanine is (pH = 6). At which pH, maximum concentration of zwitter ion of alanine will be present?
  A)
  pH>6                           done clear
  B)
  pH<6 done clear
  C)
  pH=6                           done clear
  D)
  pH=7 done clear
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• question_answer51)
  \[H-C\equiv C-H\xrightarrow[{{H}_{2}}S{{O}_{4}}]{HgS{{O}_{4}}}(A)\] \[\xrightarrow[(2)\,{{H}_{3}}{{O}^{+}}]{(1)\,N{{H}_{3}}+HCN}(B);\] Product [B] of given reaction is:
  A)
  Glycine              done clear
  B)
  Alanine done clear
  C)
  valine                            done clear
  D)
  Leucine done clear
  View Solution play_arrow

• question_answer52)
  The dipeptide, Gly. Ala has structure -
  A)
  \[{{H}_{3}}\overset{+}{\mathop{N}}\,C{{H}_{2}}\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,NH\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,HC{{\bar{O}}_{2}}\] done clear
  B)
  \[{{H}_{3}}\overset{+}{\mathop{N}}\,\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,H\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,NH\underset{{}}{\mathop{\underset{{}}{\mathop{C}}\,}}\,{{H}_{2}}C{{\overset{-}{\mathop{O}}\,}_{2}}\] done clear
  C)
  \[{{\overset{-}{\mathop{O}}\,}_{2}}C\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,HNH-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-\underset{{}}{\mathop{\underset{{}}{\mathop{C}}\,}}\,{{H}_{2}}\overset{+}{\mathop{N}}\,{{H}_{3}}\] done clear
  D)
  \[{{\overset{-}{\mathop{O}}\,}_{2}}CC{{H}_{2}}NH-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,H\overset{+}{\mathop{N}}\,{{H}_{3}}\] done clear
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• question_answer53)
  All of the following statements apply to proteins except
  A)
  Proteins generally have no definite melting point done clear
  B)
  Proteins contain the grouping -CONH- done clear
  C)
  Proteins have high molecular weight done clear
  D)
  Proteins can only contain the elements C, H, O and N. done clear
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• question_answer54)
  The reason for double helical structure of DNA is the operation of:
  A)
  Electrostatic attractions done clear
  B)
  van der Waals forces done clear
  C)
  Dipole - Dipole interactions done clear
  D)
  Hydrogen bonding done clear
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• question_answer55)
  Among the following organic acids, the acid present in rancid butter is:
  A)
  Pyruvicacid        done clear
  B)
  Lactic acid done clear
  C)
  Butyric acid      done clear
  D)
  Acetic acid done clear
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• question_answer56)
  Which of the following enzyme converts starch into maltose?
  A)
  Diastase             done clear
  B)
  Maltase done clear
  C)
  Zymase                         done clear
  D)
  Invertase done clear
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• question_answer57)
  Which statement is incorrect about peptide bond?
  A)
  C-N bond length in proteins is longer than usual C-N bond length done clear
  B)
  Spectroscopic analysis shows planar structure of \[-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-NH-\] bond done clear
  C)
  C-N bond length in proteins is smaller than usual C-N bond length done clear
  D)
  None of these done clear
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• question_answer58)
  \[D-\left( + \right)-Glucose~\xrightarrow{5{{\left( C{{H}_{3}}CO \right)}_{2}}O}D-\left( + \right)-Glucose\] pentaacetate Which statement is true about glucose pentaacetate?
  A)
  It will react with phenylhydrazine but not with Tollens' reagent. done clear
  B)
  It will react with Tollens' reagent but not with phenylhydrazine. done clear
  C)
  It will react with both of the above mentioned reagents. done clear
  D)
  It will react neither with phenylhydrazine nor with Tollens' reagent. done clear
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• question_answer59)
  Which of the following structures represents thymine?
  A)
           done clear
  B)
  done clear
  C)
                    done clear
  D)
  done clear
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• question_answer60)
  Among the following vitamins the one whose deficiency causes rickets (bone deficiency) is
  A)
  Vitamin A          done clear
  B)
  Vitamin B done clear
  C)
  Vitamin D          done clear
  D)
  Vitamin C done clear
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