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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Which of the following vitamins is a coenzyme for amino acid and fatty acid metabolism?

(a) Vitamin B6                (b) Vitamin B12

(c) Vitamin B1                (d) Vitamin B2

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The inhibition of succinic dehydrogenase by malonate is an example of

(a) competitive inhibition

(b) non-competitive inhibition

(c) allosteric modulation

(d) none of the above

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In RNA thymine is replaced by

(a) uracil                           (b) adenine

(c) thiamine                       (d) guanine

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