Understanding Viruses

Viruses are non-living microorganisms that must reproduce inside a host, making them obligate intracellular parasites. They differ from living cells in three main ways: they are acellular, having only a protein coat surrounding nucleic acid; they contain either DNA or RNA, but not both; and they require host cells for reproduction.

What characteristic makes viruses obligate intracellular parasites?

• They can survive without a host.

• They have both DNA and RNA.

• They are composed of multiple cells.

• They must reproduce inside a host.

How do viruses differ from living cells in terms of cellular structure?

• Viruses are composed of multiple cells.

• Viruses have a complex cellular structure.

• Viruses are acellular and not composed of cells.

• Viruses have a cell wall.

What is the simplest form of a virus composed of?

• A nucleus and organelles.

• A capsid and nucleic acid.

• A cell wall and chloroplasts.

• A cell membrane and cytoplasm.

What type of genetic material can a virus contain?

• Both DNA and RNA.

• Only DNA.

• Only RNA.

• Either DNA or RNA, but not both.

Where must viruses reproduce to ensure their survival?

• In the open environment.

• In water bodies.

• On the surface of plants.

• Inside host cells.