Name: Hormones
Uploaded: 2019-07-19
Duration: 2 min 32 s
Description: Hormones are chemical compounds with high biological importance. They are secreted by different glands in the human body. Let's explore this combo of biology...

Question

Write notes on proteins.

Accepted Answer

Proteins are polypeptide chains of amino acids.
Classification of proteins : Proteins can be classified into two type on the basis of their molecular shape:
a) Fibrous proteins : These are fibre like proteins, the polypeptide chains are parallel which are held together by hydrogen and disulphide bonds. These are insoluble in water. Example: Keratin present in hair, wool silk etc, and myosin in muscles.
b) Globular proteins : In these proteins, the polypeptide chains coil around to give a spherical shape. These are soluble in water. Ex. : Insulin and albumin.

The structure of proteins is explained in four different levels.
a) primary structure b) secondary structure c) tertiary structure d) quaternary structure
Protein Denaturation : The phenomenon of disorganization of native protein structure is known as denaturation. Denaturation results in the loss of secondary, tertiary and quaternary structure of proteins. This involves a change in physical, chemical and biological properties of protein molecules.
Agents of denaturation :
Physical agents - heat, violent shaking, X - rays, UV - radiation
Chemical agents - Acids, alkalies, organic solvents, urea, salt of heavy metals.

Write notes on proteins.

Important Questions on Biomolecules

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