Question

Tertiary and quaternary structu biology classre of protein

Answer 1

Explanation:

Tertiary structure:

Usually a polypeptide chain bends and folds upon itself forming a globular shape.

This is the proteins'tertiary conformation.

It is maintained by 3 types of bonds namely:

1. Ionic bond
2. Hydrogen bond
3. Disulphide (-S-S-)

For example:, in aqueous environment the most stable tertiary conformation is that in which hydrophobic amino acids are burried inside while the hydophilic amino acids are on the surface of the molecule.

Quaternary Structure:

In many highly complex proteins, polypeptide tertiary chains are aggregated and held together by

1. Hydrophobic interactions
2. Hydrogen bonds
3. Ionic bonds

This specific arrangement is the quaternary structure.

Haemoglobin, the oxygen carrying protein of RBCs, exhibits such a structure..

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