G.N. Ramachandran discovered the structure of collagen which is a/an:

1. Alpha helix

2. Beta pleated sheet

3. Triple helix

4. Icosahederon

Which of the following elements is present in higher proportion [% weight of the total] in Earth's crust with respect to the average composition of a human body?

1. Carbon

2. Nitrogen

3. Sulfur

4. Magnesium

Identify the amino acid with hydroxymethyl as its R group:

1. Glycine

2. Alanine

3. Serine

4. Phenylalanine

All of the following are nucleosides, except:

Which of the following secondary metabolites is an anticancer drug?

1.  Vinblastin

2.  Concanavalin A

3.  Abrin

4.  Ricin

Identify the incorrect statement regarding the structure of proteins:

At each step of its ascent, the DNA strand turns:

1. 3.4$°$

2. 34$°$

3. 3.6$°$

4. 36$°$

The substrate has to go through a much higher energy state or transition state in case of:

1. Exothermic reactions only

2. Endothermic reactions only

3. Both exothermic and endothermic reactions

4. Neither exothermic nor endothermic reactions

When the co-factor is removed from the enzyme, the catalytic activity:

1. is lost.

2. is reduced.

3. is increased.

4. is unaffected.

In an average composition of a cell, the maximum % of total cellular mass [after water and protein] is constituted by:

1. Carbohydrates

2. Lipid

3. Nucleic acids

4. Ions