Mad cow disease is caused by a

A. virus.
B. bacterium.
C. prion.
D. viroid.
E. virion.


Answer: C

Biology & Microbiology

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The ________ is the collection of microorganisms (and their genes) that are normally present in and on an organism.

Fill in the blank(s) with the appropriate word(s).

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A naked virus exits a cell by ________; an enveloped virus exits a cell by ________.

A) lysis, budding off B) budding off, lysis C) the lytic cycle, the lysogenic cycle D) endocytosis, exocytosis

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A seed has three parts: an embryo, a source of food for the developing embryo called ________, and a protective cover.

A. antheridium B. ovule C. rhizoid D. endosperm E. cone

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The plasma membrane is ______ permeable

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology