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| Single-celled organisms that lack a nucleus; prokaryotes. |
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| The region between the cell membrane and the nucleus; in organisms without a nucleus, the region located inside the cell membrane. |
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| A small grain-like structure in the cytoplasm of a cell where proteins are made. |
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| A long, whiplike structure used for movement that extends out through the cell membrane and cell wall. |
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| The process of breaking down food to release its energy. |
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| A form of asexual reproduction in which one cell divides to form two identical cells. |
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| The process by which a single organism produces a new organism identical to itself. |
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| The process by which a new organism forms from the joining of two sex cells. |
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| The process in which a unicellular organism transfers some of its genetic material to another unicellular organism. |
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| A small, rounded, thick-walled, resting cell that forms inside a bacterial cell. |
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| A heating process where food is heated to a temperature that is high enough to kill most harmful bacteria without changing the taste of the food. |
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| An organism that breaks down wastes and dead organisms. |
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| A small, nonliving particle that invades and then reproduces inside a living cell. |
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| An organism that provides a source of energy or a suitable environment for a virus or for another organism to live. |
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| An organism that lives on or in a host and causes harm to the host. |
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| A virus that infects bacteria. |
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