Question

Short / Long answer type questions.
Distinguish between the lysogenic and lytic phases in the life cycle of a virus.

Answer 1

1. In the Lysogenic phase of the virus, the viral genome or its complementary DNA gets integrated with the host DNA. It is called pro-phage or provirus.
2. The host DNA is not hydrolyzed during the lysogenic phase.
3. The pro-phage or provirus replicates only once along with the replication of the host genome so that a single particle is transferred to a daughter cell.
4. The cellular machinery of the host is only slightly disturbed.
5. The virus is non-virulent or temperate.
6. The host cell does not get lysed.
7. Virus particles are liberated only rarely.

1. In the lytic phase of the virus life cycle, the viral genome does not integrate with host DNA.
2. The host DNA is often hydrolyzed in the lytic phase.
3. The viral genome replicates repeatedly and forms a number of copies in the same host cell.
   
4. The cellular machinery of the host is, completely taken over by the viral genome.
5. The host cell undergoes lysis.
6. A number of virus particles are liberated when the host cell becomes lysed.