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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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