write a short note on virus.
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A virus is a microscopic parasite which can infect living organisms and cause disease. It can make copies of itself inside another organisms cells. Viruses consist of nucleic acid + a protein coat. Usually the nucleic acid is RNA; sometimes it is DNA.
Answer:
1.an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.
"the hepatitis B virus"
2.
a piece of code which is capable of copying itself and typically has a detrimental effect, such as corrupting the system or destroying data.
Explanation: