NEET BIOLOGY

Detailed explanation-1: -A virus is a tiny, infectious particle that can reproduce only by infecting a host cell. Viruses “commandeer” the host cell and use its resources to make more viruses, basically reprogramming it to become a virus factory. Because they can’t reproduce by themselves (without a host), viruses are not considered living.

Detailed explanation-2: -During attachment and penetration, the virus attaches itself to a host cell and injects its genetic material into it. During uncoating, replication, and assembly, the viral DNA or RNA incorporates itself into the host cell’s genetic material and induces it to replicate the viral genome.

Detailed explanation-3: -Most scientists don’t think of viruses as living things, because they can’t reproduce without help from a living cell. They need to invade a cell in order to make more viruses. Viruses like the rhinovirus shown here (which causes the common cold) don’t have a fatty envelope.

Detailed explanation-4: -Replication: The virus takes over the cell’s metabolism, causing the creation of new proteins and nucleic acids by the host cell’s organelles. Assembly: Proteins and nucleic acids are assembled into new viruses. Release: Virus enzymes cause the cell to burst and viruses are released from the host cell.