Chemical nature of virus Chemical composition of viral

Chemical nature of virus Chemical composition of viral particle and the function of each component.

Main chemical components Protein Nucleic acid Chemically, viruses are nucleoprotein

Viral constituents 1. 2. 3. 4. 5. Protein. Nucleic acid. Lipids. Carbohydrates. Other chemical components.

Viral constituents 1. 2. 3. 4. 5. Protein. Nucleic acid. Lipids. Carbohydrates. Other chemical components.

Functions of protein Protection enzymes Definite shapes Cell fusion Antigenic determent Entry of N. A. Attachment

Viral constituents 1. Protein. 2. Nucleic acid. 3. Lipids. 4. Carbohydrates. 5. Other chemical components.

Nucleotide 1. Phosphate 3. Nitrogen base 2. Carbohydrate

Phosphate group

Pentose sugar

Nitrogen bases: 1. Purine 2. Pyrimidine

Nucleoside

nucleotide

Double helix arrangement

Types of nucleic acid

Function of N. A. Carrier of Genetic information i. e. infection and replication Confirmation Smith (1949), Hershy (1952) , Conrat (1956)

Conrat confirmation

Viral constituents 1. Protein. 2. Nucleic acid. 3. Lipids. 4. Carbohydrates. 5. Other chemical components.

Origin of viral lipids Vacuolar membrane Plasma membrane

Functions of lipids Liberation of N. A. Attachment Protection of nucleoprotein i. e. Increasing infectivity

Viral constituents 1. Protein. 2. Nucleic acid. 3. Lipids. 4. Carbohydrates. 5. Other chemical components.

Viral constituents 1. Protein. 2. Nucleic acid. 3. Lipids. 4. Carbohydrates. 5. Other chemical components.

Other chemical components Water Cations Polyamines