Biomolecules

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

1. On hydrolysis (+) lactose gives equal amount of D(+) glucose and D(+) galactose.
2. (+) Lactose is a -glucoside formed by the union of a molecule of D(+) glucose and a molecule of D(+) galactose.
3. (+) Lactose is a reducing sugar and does not exhibit mutarotation.
4. (+) Lactose, C12H22O11 contains 8 –OH groups

Fructose reduces Tollens' reagent due to

1. asymmetric carbons
2. primary alcoholic group
3. secondary alcoholic group
4. enolisation of fructose followed by conversion to aldehyde by base

Which one of the following does not exhibit the phenomenon of mutarotation?

1. (+) Sucrose
2. (+) Lactose
3. (+) Maltose
4. (−) Fructose

The segment of DNA which acts as the instructional manual for the synthesis of the protein is

1. ribose
2. gene
3. nucleoside
4. nucleotide

Which of the following hormones contains iodine?

1. Testosterone
2. Adrenaline
3. Thyroxine
4. Insulin

In DNA, the complementary bases are

1. adenine and guanine; thymine and cytosine
2. uracil and adenine; cytosine and guanine
3. adenine and thymine; guanine and cytosine
4. adenine and thymine; guanine and uracil.

Which of the following is an amine hormone?

1. Insulin
2. Progesterone
3. Thyroxine
4. Oxypurine

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

1. chiral bases
2. chiral phosphate ester units
3. D-sugar component
4. L-sugar component

Which of the following vitamins is water-soluble?

1. Vitamin E
2. Vitamin K
3. Vitamin A
4. Vitamin B

The human body does not produce

1. enzymes
2. DNA
3. vitamins
4. hormones