Glucose and Mannose are

1. C₁ epimers

2. Anomers

3. C₂ epimers

4. C₄ epimers

Which of the following is the correct statement?

Which type of amino acid is lysine ?

1. b - Amino acid

2. Acidic

3. Basic

4. Neutral

At iso-electric point:

(a) conc. of cation is equal to conc of anion

(b) Net charge is zero.

(c) Maximum conc. of di-polar ion (Zwitterion) will be present

(d) All of the above

An antigen develops antibodies which protect the body from their harmful effects. The antibodies
are:-

(a) immunoglobulins

(b) phospholipids

(c) albumins

(d) lymphocytes

Which of the following is protein hormones?

(a) Insulin

(b) Oxytocin

(c) Both (a) and (b)

(d) None of the above

The structural feature which distinguishes proline from other natural $\alpha$-amino acids is -

1. It is optically inactive.

2. It contains an aromatic group.

3. It is a dicarboxylic acid.

4. It is a secondary amine.

Insulin and carboxypeptidase contains respectively

1. Cu, Zn

2. Ag, Cu

3.  Cu, Cu

4.  Zn, Zn

$\mathrm{\alpha }$-helix is also known as:

1.  Sheet structure

2.  Flat structure

3.  3.613 helix

4.  4.915 helix

The vitamin which causes impotency is

(1) Calciferol

(2) Biotin

(3) Tocopherol

(4) Retinol