Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?

(a) Thymine, Uracil         - Pyrimidines

(b) Uracil, Cytosine         - Pyrimidines

(c) Guanine, Adenine      - Purines

(d) Adenine, Thymine     - Purines

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A competive inhibitor of succinic dehydrogenase is

(a) malonate                 (b) oxaloacetate

(c) α-ketoglutarate        (d) malate

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An organic substance bound to an enzyme and essential for its activity is called:

(a) coenzyme                    (b) holoenzyme

(c) apoenzyme                  (d) isoenzyme

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The enzyme amylase belongs to the class

(a) hydrolase                        (b) isomerase

(c) transferase                      (d) lyases

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Which of the following is an essential amino acid?

(a) Cystine                          (b) Glycine

(c) Phenylalanine                 (d) Serine

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NAD, NADH and NADP are

(a) not a participant in any catalytic reaction

(b) participants as cofactors in non-catalytic reaction

(c) participants as cofactor in enzyme catalysed reactions

(d) participants as cofactor in both non-catalytic and enzyme catalysed reactions.

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DNA has deoxyribose as the constituent sugar. The position where the sugar lacks oxygen is

(a) 1

(b) 2

(c) 3

(d) 4

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The linkage that joins two adjacent nucleotides in RNA is

(a) phosphate ester                 (b) phosphodiester

(c) phosphate anhydride          (d) N-glycoside

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Phosphodiester bond is present in

(a) ATP                    (b) ADP

(c) cAMP                  (d) none of these

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Heating may cause denaturation of enzyme or protein mainly by damaging its

(a) physical configuration

(b) chemical structure

(c) both physical configuration as well as chemical structure

(d) other properties.

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