Multiple Choice Questions

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Assertion : Activity of an enzyme is pH dependent.

Reason : Change in pH affects the solubility of the enzyme in water.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

  • If both assertion and reason are true and the reason is not the correct explanation of the assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


B.

If both assertion and reason are true and the reason is not the correct explanation of the assertion.

Enzymes are proteins which act as catalyst for bio-chemical reactions. pH affect their activity as protonation-deprotonation may cause denaturation of the protein structure. Solubility is also affected.


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Vitamin C is

  • citric acid

  • lactic acid

  • paracetamol 

  • ascorbic acid


Assertion : Glycosides are hydrolysed in acidic conditions.

Reason : Glycosides are acetals.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

  • If both assertion and reason are true and the reason is not the correct explanation of the assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


The number of amino acids and number of peptide bonds in a linear tetrapeptide (made of different amino acids) are respectively

  • 4 and 4

  • 5 and 5

  • 5 and 4

  • 4 and 3


Assertion: DNA molecules and RNA molecules are found in the nucleus of a cell.
Reason: On heating, the enzymes do not lose their specific activity.

  • If both assertion and reason are true and reason is a correct explanation of the assertion.

  • If both the assertion and reason are true but the reason is not a correct explanation of the assertion.

  • If the assertion is true but the reason is false.

  • If both the assertion and reason are false.


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In DNA, the consecutive deoxynucleotides are connected via

  • phosphodiester linkage

  • phosphomonoester linkage

  • phosphotriester linkage

  • amide linkage


In aqueous solution glucose remains as:

  • only in the open-chain form

  • only in the pyranose form

  • only in furanose form

  • in all three forms in equilibrium


A tripeptide is written as glycine-alanine -glycine. The correct structure of the tripeptide is


Which one is not a constituent of nucleic acid?

  • Uracil

  • Guanidine

  • Phosphoric acid

  • Ribose sugar


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Which of the following contributes to the double helical structure of DNA ?

  • Hydrogen bond

  • Covalent bond

  • Disulphide bond

  • van der Waals' force


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