First slide

Viruses, Viroids,Prions and Lichens

Question

Identify the correct statement w.r.t. viruses.

Easy

A

Viruses possess their own metabolic system.
B

All viruses contain both RNA and DNA.
C

Viruses are obligate parasites.
D

Nucleic acid of viruses is known as capsid.

Solution

Viruses contain a protein coat known as capsid which encloses a single type of nucleic acid, either RNA or DNA. They do not have enzymes for protein synthesis. They multiply only inside the living host cell and for multiplication they take over the machinery of the host cell. Thus, viruses are obligatory intracellular parasites.

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