Final answer:
A virus is acellular because it lacks cellular structures and cannot replicate without a host cell. So, correct option is (B).
Step-by-step explanation:
The organism that is acellular is the virus. Unlike bacteria, algae, or protozoa, viruses do not consist of cells and lack cell organelles such as a nucleus or ribosomes. They must infect a host cell and use that cell’s machinery to replicate. This unique characteristic defines viruses as acellular, meaning they are not made up of cells, unlike all other forms of life.
Influenza A virus, for instance, is a type of virus that replicates by infecting host cells. Although viruses contain genetic material (either DNA or RNA), they require a host to carry out the functions necessary for reproduction.
A virus is an acellular organism, meaning it does not consist of cells. Unlike bacteria, algae, and protozoa, viruses do not have cell organelles or cell membranes. Instead, they have a protein coat called a capsid that surrounds their genetic material. Viruses are unable to replicate on their own and depend on host cells to reproduce.