NEET BIOLOGY

Detailed explanation-1: -Some viruses are restricted in the kinds of cells in which they replicate, and a few have not yet been cultivated at all under laboratory conditions. However, most viruses are grown in cultured cells, embryonated hen’s eggs, or laboratory animals.

Detailed explanation-2: -This is because they use all of the host cell’s DNA replication mechanisms to replicate, or make copies of their own RNA / DNA, to make many new identical viruses. This is why we cannot grow them in the lab. They do not grow on agar plates.

Detailed explanation-3: -Viruses cannot be grown in standard microbiological broths or on agar plates, instead they have be to cultured inside suitable host cells.

Detailed explanation-4: -Viruses are obligate intracellular parasites so they depend on host for their survival. They cannot be grown in non-living culture media or on agar plates alone, they must require living cells to support their replication.