IMMUNOLOGY

Detailed explanation-1: -Most intracellular bacteria and parasites carry the basic genetic information required for their own metabolism and replication, and they rely on their host cells only for nutrients.

Detailed explanation-2: -Viruses depend on the host cells that they infect to reproduce. When found outside of host cells, viruses exist as a protein coat or capsid, sometimes enclosed within a membrane. The capsid encloses either DNA or RNA which codes for the virus elements.

Detailed explanation-3: -A lysogenic virus remains inactive for a period of time. In the lysogenic cycle, the viral DNA gets integrated with the host’s DNA and gets copied when the host cell replicates.