Amino acids exhibit amphoteric behavior as -

1. They can act both as an acid and as a base.

2. They can act only as an acid but not as a base.

3. They can act only as a base but not an acid.

4. None of the above.

The secondary structure of protein is represented by:

A linkage present in proteins and peptides is:

1.		2.
3.		4.

α-helix structure of proteins is stabilized by :

An insoluble biomolecule in water is-

The denaturation of proteins indicates -

One of the essential α-amino acids is:

Examples of globular proteins are:

Choose the correct option : 
1. a and b
2. b and c
3. c and d
4. a and c