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121.

What are essential and non-essential amino acid? Give two examples of each type.

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122.

Define the following as related to proteins:
(i) Peptide linkage (ii) Primary structure (iii) Denaturation.

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123.

What are the common types of secondary structure of proteins?

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Difference between globular protein and fibrous protein:

Fibrous protein	Globular protein
1.It is a fibre-like structure formed by the polypeptide chain. These proteins are held together by strong hydrogen and disulphide bonds	1. The polypeptide chain in this protein is folded around itself, giving rise to a spherical Structure.
2. It is usually insoluble in water, but soluble in strong acids and bases.	2. It is usually soluble in water, acids, bases and salts.
3. They have comparatively stronger intermolecular forces of attraction.	3. They have weak intermolecular hydrogen bonding.
4. Example: Collagen, fibroin, myosin, hair, skin,silk, wool, etc.	4. Egg, albumin, casein of milk, insulin.