MCQ IN MEDICINE

Detailed explanation-1: -Viruses cannot replicate unless absorbed by cells in our body. Once a virus is outside the body, its capsid starts to degrade, and the more degraded its capsid is, the less likely it is to survive.

Detailed explanation-2: -Viruses need to invade a host cell because viruses don’t have the capability to reproduce, so they replicate themselves inside the host cell.

Detailed explanation-3: -Viruses are made of genetic material and protein coat. They do not have cellular machinery required for viral multiplication. Once it infects a susceptible cell, the virus can direct the host cell machinery to produce the viral genome and viral proteins to make new capsids.

Detailed explanation-4: -Effects on Cell Biochemistry: Many viruses inhibit the synthesis of host cell macromolecules, including DNA, RNA, and protein. Viruses may also change cellular transcriptional activity, and protein-protein interactions, promoting efficient production of progeny virus.