Bacteria, Protist and Virus Vocabulary

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A single-celled organism with a nucleus and organelles, including amoebas, euglenas, paramecia and volvox.

An organelle of the protist euglena that is sensitive to light.

A unicellular organism that lacks a true nucleus and membrane-bound organelle.

A whip-like structure on unicellular organisms that aids with movement.

Either unicellular or multi-cellular organism that contains membrane-bound organelles and genetic material within a nucleus.

An extension of the cytoplasm used for movement in some organisms.

Unicellular organisms that lack membrane-bound structures; a common term used to describe prokaryotes.

A particle consisting of DNA encased in a protein coat that must inject its DNA into a living cell in order to reproduce.