What are tiny packages of DNA and RNA enclosed in protein shells that invade a cell?

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Multiple Choice

What are tiny packages of DNA and RNA enclosed in protein shells that invade a cell?

Explanation:
These are viruses. A virus is a tiny, noncellular infectious agent that carries its genetic material—DNA or RNA—inside a protein coat called a capsid, sometimes with a lipid envelope. They cannot replicate on their own, so they invade a host cell and hijack its machinery to produce new viral particles. This combination of a nucleic acid genome enclosed in a protein shell that targets and enters cells is what distinguishes viruses from bacteria and fungi, which are cells with their own metabolic processes, and from parasites, which are living organisms that may not rely on a protein-shell packaging to spread.

These are viruses. A virus is a tiny, noncellular infectious agent that carries its genetic material—DNA or RNA—inside a protein coat called a capsid, sometimes with a lipid envelope. They cannot replicate on their own, so they invade a host cell and hijack its machinery to produce new viral particles. This combination of a nucleic acid genome enclosed in a protein shell that targets and enters cells is what distinguishes viruses from bacteria and fungi, which are cells with their own metabolic processes, and from parasites, which are living organisms that may not rely on a protein-shell packaging to spread.

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