Prokaryotes and Viruses (IGCSE Biology)

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Last updated 1:46 AM on 9/4/26
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7 Terms

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prokaryote

A single-celled organism with no nucleus (e.g. bacteria).

<p>A single-celled organism with no nucleus (e.g. bacteria).</p>
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bacterium

A prokaryotic microorganism; some are useful, some cause disease.

<p>A prokaryotic microorganism; some are useful, some cause disease.</p>
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plasmid

A small circular loop of extra DNA in a bacterial cell.

<p>A small circular loop of extra DNA in a bacterial cell.</p>
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circular chromosome

The main loop of DNA in a bacterium, floating free in the cytoplasm.

<p>The main loop of DNA in a bacterium, floating free in the cytoplasm.</p>
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pathogen

A microorganism that causes disease.

<p>A microorganism that causes disease.</p>
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virus

A non-living particle (a protein coat around DNA or RNA) that reproduces only inside a host cell.

<p>A non-living particle (a protein coat around DNA or RNA) that reproduces only inside a host cell.</p>
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capsid

The protein coat that surrounds a virus.

<p>The protein coat that surrounds a virus.</p>