MCAT Question A Day - 5/22/14 - Answer!

A mature virus outside the host cell is called a virion. A virion may contain all of the following EXCEPT:

A. a capsid.

B. an envelope made from a phospholipid bilayer.

C. core proteins.

D. both RNA and DNA.

D is correct. A virus cannot contain both DNA and RNA. Many viruses contain proteins.

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