NEET BIOLOGY

Detailed explanation-1: -The viral replication process begins when a virus infects its host by attaching to the host cell and penetrating the cell wall or membrane. The virus’s genome is uncoated from the protein and injected into the host cell.

Detailed explanation-2: -The viral attachment protein can be viewed as the “key” that unlocks host cells by interacting with the “lock”-the receptor-on the cell surface, and these lock-and-key interactions are critical for viruses to successfully invade host cells.

Detailed explanation-3: -Host cells that allow viruses or bacteria to invade them are called permissive cells. All cells are not permissive cells. Molecular receptor specificity on the surface of the host cells determines the probability of invasion by a bacteria or virus.