12th Class Chemistry Biomolecules / जैव-अणु Question Bank

done Assertion And Reason (MCQs) - Biomolecules Total Questions - 15

• question_answer1)

  Directions : (1 - 15)

  For question numbers 1-15, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

  Assertion : Cysteine can cross link peptide chains.

  Reason : Ammo acids are classified as essential and non-essential amino acids.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer2)

  Assertion : Glucose and fructose give the same osazone.

  Reason : During osazone formation stereochemistry at \[{{C}_{1}}\] and \[{{C}_{2}}\] is destroyed.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer3)

  Assertion : Valine is an essential amino acid.

  Reason: The lack of essential ammo acids in the diet causes Kwashiorkor.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer4)

  Assertion : Disruption of the native structure of a protein is called denaturation.

  Reason : The change in colour and appearance of egg during cooking is due to denaturation.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer5)

  Assertion : The specific rotation of a freshly prepared solution of a-glucose decreases from \[+112{}^\circ \] to \[52.7{}^\circ \] while that of (\[\beta \]-glucose increases from \[+\text{ }19{}^\circ \] to \[52.7{}^\circ \].

  Reason : The change in specific rotation of an optically active compound with time to an equilibrium value is called mutarotation.

   
  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer6)

  Assertion : Fructose reduces Fehling's solution and Tollens' reagent.

  Reason: Fructose does not contain any aldehyde group.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer7)

  Assertion : DNA undergoes replication.

  Reason : DNA contains cytosine and thymine as pyrimidine bases.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer8)

  Assertion : Amino acids are insoluble in benzene and ether.

  Reason : Amino acids exist as zwitter ions.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer9)

  Assertion : Haemoglobin is a globular protein.

  Reason : Globular proteins are insoluble in water.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer10)

  Assertion : Nucleotides are phosphate esters of nucleosides.

  Reason: The various nucleotides in nucleic acids are linked either through purine or pyrimidine bases.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer11)

  Assertion : Solubility of proteins is minimum at the isoelectric point.

  Reason : At isoelectric point, protein molecule behaves as a zwitter ion.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer12)

  Assertion : Alpha (\[\alpha \])-amino acids exist as internal salt in solution as they have amino and carboxylic acid groups in near vicinity.

  Reason : \[{{H}^{+}}\] ion given by carboxylic group \[\left( -COOH \right)\] is captured by amino group \[(-N{{H}_{2}})\] having lone pair of electrons.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer13)

  Assertion : DNA has a double helix structure.

  Reason: The two strands in a DNA molecule are exactly similar.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer14)

  Assertion : Glucose and fructose are reducing sugars.

  Reason : Glucose and fructose contain a free aldehydic and ketonic group adjacent to a \[>CHOH\]group respectively.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer15)

  Assertion : Glucose when treated with \[C{{H}_{3}}OH\] in presence of dry HCl gas gives \[\alpha \]-and \[\beta \]-methyl glucosides.

  Reason : Glucose reacts with phenyl hydrazine to form crystalline osazone.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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