PATHOLOGY

Detailed explanation-1: -For instance, viruses can reproduce inside a host just like any other living organism, but this ability to reproduce is lost when the virus is outside the host cell. This is because viruses do not have the cellular machinery that is required to multiply, hence they hijack a living cell.

Detailed explanation-2: -Outside of a host cell, viruses do not use any energy. They only become active when they come into contact with a host cell. Once activated, they use the host cell’s energy and tools to make more viruses. Because they do not use their own energy, some scientists do not consider them alive.

Detailed explanation-3: -A virus is an infectious microbe consisting of a segment of nucleic acid (either DNA or RNA) surrounded by a protein coat.

Detailed explanation-4: -Viruses are really, really, small (even 100x smaller than bacteria!) pathogens that can only replicate within a living organism, called a host.

Detailed explanation-5: -Viruses are considered as something between living and non-living because they do not grow or reproduce by themselves. This makes them non-living. However, when a virus enters a living cell of an organism, it obtains energy from the host cell and starts reproducing.