In a protein molecule, various amino acids are linked together by

(1) b-glycosidic bond

(2) peptide bond

(3) dative bond

(4) a-glycosidic bond

The correct statement regarding RNA and DNA, respectively is:

D-(+)-glucose reacts with hydroxylamine and yields an oxime. The structure of the

oxime would be:-

1.

2.

3.

4.

Which of the following hormones is produced under the condition of stress which

stimulates glycogenolysis in the liver of human beings?

1. Thyroxin               

2. Insulin

3. Adrenaline             

4. Estradiol

Deficiency of vitamin B₁ causes the disease

1. convulsions

2. beri-beri

3. cheilosis

4. sterility

Which one of the following sets of monosaccharides forms sucrose?

1. a-D-galactopyranose and a-D-glucopyranose

2. α-D-glucopyranose and   b-D-fructofuranose

3. b-D -glucopyranose and a-D fructofuranose

4. α-D-glucopyranose and  b-D-fructopyranose

Which one of the following statements is not true regarding (+) lactose?

1. (+) lactose is a β-glycoside formed by the union of a molecule of D(+) glucose and a

molecule of D(+) galactose

2. (+) lactose is a reducing sugar and does not exhibit mutarotation

3. (+) lactose, C₁₂H₂₂O₁₁ contains 8-OH groups

4. On hydrolysis (+) lactose gives equal amount of D(+) glucose and D(+) galactose

In DNA, the complementary bases are:-

(1) Adenine and thymine; guanine and cytosine

(2) Adenine and thymine; guanine and uracil

(3) Adenine and guanine; thymine and cytosine

(4) Uracil and adenine; cytosine and guanine

Which one of the following vitamins is water-soluble?
(1) Vitamin-B

(2) Vitamin-E

(3) Vitamin-K

(4) Vitamin-A

RNA and DNA are chiral molecules, their chirality is due to :-

(1) L-sugar component

(2) chiral bases

(3) chiral phosphate ester units

(4) D-sugar component