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.

An optically inactive amino acid is-

α-helix structure of proteins is stabilized by :

An insoluble biomolecule in water is-

The denaturation of proteins indicates -

The helical structure of a protein is stabilized by:

In humans, the main oxygen carrier in the blood is -

1. Hemocyanin

2. Proteins

3. Haemoglobin

4. Both microorganisms and haemoglobin.