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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Which of the following is incorrect?

(a) The hair protein, keratin, is synthesized from the amino acid methionine

(b) Phospholipids act as carriers of small non polar molecules across the cell membrane

(c) Dietary intake of PUFA decreases the serum cholesterol level in our body

(d) Cobalt is a constituent of Vit B12

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