The ${\mathrm{pK}}_{{\mathrm{a}}_1}, {\mathrm{pK}}_{{\mathrm{a}}_2} \mathrm{and} {\mathrm{pk}}_{{\mathrm{a}}_3}$ of the dication of lysine $\begin{array}{c}\left({\mathrm{H}}_3\stackrel{+}{\mathrm{N}} - {\left({\mathrm{CH}}_2\right)}_4 - \mathrm{CH} - \mathrm{COOH}\right)\\ \begin{array}{c} |\\ +{\mathrm{NH}}_3\end{array}\end{array}$ are 2.18, 8.95 and 10.53 respectively. Calculate the pH of lysine at its isoelectric point.

1.  9.74

2.  7.22

3.  5.57

4.  6.36

Millon's test is given by that protein

1.  Which contain phenolic amino acids

2.  Which contain amino acid having S

3.  Which contain the basic amino acid

4.  Which contain the neutral amino acid

The vitamin which causes impotency is

(1) Calciferol

(2) Biotin

(3) Tocopherol

(4) Retinol

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

(1)  Sheet structure

(2)  Flat structure

(3)  3.613 helix

(4)  4.915 helix

Insulin and carboxypeptidase contains respectively

1. Cu, Zn

2. Ag, Cu

3.  Cu, Cu

4.  Zn, Zn

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.

If $\mathrm{\alpha }$—D—glucose is dissolved in water and kept for a few hours, the major constituent(s) present in the solution is/are:

The compound that does not reduce Benedict's solution is: 

Which structure(s) of proteins remains(s) intact during denaturation process?

1. Both secondary and tertiary structures

2. Primary structure only

3. Secondary structure only

4. Tertiary structure only

Which of the following carbohydrates is not oxidized by bromine water?

1.  D - Galactose

2.  D - Glucose

3.  D - Fructose

4.  D - Mannose