Which of the following correctly describes the hydroxyl group distribution in glucose, in addition to the aldehyde group?

1. One secondary-OH and four primary-OH

2. One primary-OH and four secondary-OH

3. Two primary-OH and three secondary-OH

4. Three primary-OH and two secondary-OH

An insoluble biomolecule in water is-

The biomolecule that contain non-transitional metal ion is: 

1. Vitamin ${\mathrm{B}}_{12}$

2. Chlorophyll

3. Haemoglobin

4. Insulin

The cell membranes are mainly composed of:

1. Fats

2. Proteins

3. Phospholipids

4. Carbohydrates

At pH = 5, glycine exists as:

1.  $\stackrel{\oplus }{\mathrm{N}}{\mathrm{H}}_3<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>{\mathrm{CH}}_2<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>\mathrm{CO}\stackrel{⊝}{\mathrm{O}}$

2.  $\stackrel{\oplus }{\mathrm{N}}{\mathrm{H}}_3<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>{\mathrm{CH}}_2<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>\mathrm{COOH}$

3.  ${\mathrm{NH}}_2<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>{\mathrm{CH}}_2<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>\mathrm{COOH}$

4.  ${\mathrm{NH}}_3<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>{\mathrm{CH}}_2<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>\mathrm{CO}\stackrel{⊝}{\mathrm{O}}$

Waxes are esters of:

1. Glycerol and fatty acid.

2. Long-chain alcohols and long-chain fatty acids.

3. Glycerol.

4. Long-chain alcohol.

 The disease caused by deficiency of vitamin B₁ is:

Sanger's reagent is used for the identification of

(1)  The N-terminal amino acid of a peptide chain

(2)  The c-terminal amino acid of a peptide chain

(3)  The sidechain of amino acids

(4)  Number of amino acid units

Which of the following carbohydrate undergo mutarotation in aqueous solution?

(1)  Maltose

(2)  Lactose

(3)  Glucose

(4)  All of these