1. Discuss the viral structure and functions of capsids, envelope. 2. Discuss th

Question

1. Discuss the viral structure and functions of capsids, envelope.

2. Discuss the viral genomes in terms of dsDNA, ssDNA, ssRNA, dsRNA and the number of segments of nucleic acid.

3. Animal virus replication of the above viruses (viral replication life cycle) to be explained, with special emphasis on RETROVIRUS (includes a positive and negative sense of RNA) replication in a host cell (this is important for the pathogenesis of viral disease and control with antiviral drugs)

4. Know the differences between “Animal” DNA (ds and ssDNA)

5. Know the Bacteriophage lysogenic and lytic life cycles and understand how and why they differ from “animal” viruses.

Explanation / Answer

1- the virion consist of nucleic acid core genome surrounded by protein coat called capsid the capsid together with nucleic acid is called nucleocapsid . Certain viruses has envelop around the nucleic acid . It is lipoprotein in nature. Envelop help the virus to attach to the host and is factor of virulence also the capsule prevent phagocytosis help in increasing virulence.

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