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Which of the following is true?

A) To quantify viruses, you can count virions with an electron microscope.
B) To quantify viruses, you can stain virions with fluorescent dyes prior to microscopic examination.

Answer :

Final answer:

To quantify viruses, you can count virions using an electron microscope, not by staining them with fluorescent dyes. Viruses can be DNA-based or RNA-based, are acellular, and replicate within host cells.

Explanation:

In general, to quantify viruses, you can count virions (individual virus particles) using an electron microscope. Most virions, which are extremely small (about 20-250 nanometers in diameter), cannot be visualized with a light microscope, making the electron microscope a vital tool in virus quantification. However, staining virions with fluorescent dyes for microscopic examination would not typically be the method employed for virus quantification because these dyes can impact the viability and integrity of the viruses.

It's important to note that not all viruses contain both DNA and RNA – they can contain either DNA or RNA. Also, viruses are indeed acellular, meaning they are not cells and require host cells to replicate. Despite being acellular, they do not replicate outside the cell as they hijack the host cell's replication machinery to reproduce.

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