Unit 2 - Viruses, Bacteria, Protists, and Fungi

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What is a virus?

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A virus is a tiny infectious agent that can only replicate inside the living cells of an organism. It is not considered a living organism because it cannot reproduce on its own.

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Do viruses have a nucleus?

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No, viruses do not have a nucleus. They are made up of genetic material (DNA or RNA) surrounded by a protein coat.

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What are bacteria?

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Bacteria are single-celled microorganisms that can be found in various environments. They can be beneficial or harmful to other living organisms.

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What is the role of decomposers in an ecosystem?

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Decomposers, such as certain bacteria and fungi, break down dead organic matter, returning nutrients to the soil and helping to recycle materials in the ecosystem.

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What shape are cocci bacteria?

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Cocci bacteria are spherical in shape.

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What shape are bacilli bacteria?

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Bacilli bacteria are rod-shaped.

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What shape are spirilla bacteria?

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Spirilla bacteria are spiral-shaped.

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What is flagella?

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Flagella are long, whip-like structures that help some bacteria move.

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Can bacteria reproduce on their own?

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Yes, bacteria can reproduce on their own through a process called binary fission.

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What is the cell wall?

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The cell wall is a rigid outer layer that provides structure and protection to bacterial cells.