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MCAT Question A Day - 5/23/14 - Answer!

Prior to infecting a bacterium, a bacteriophage must:

A.  reproduce, making copies of the phage chromosome.
B.  integrate its genome into the bacterial chromosome.
C.  penetrate the bacterial cell wall completely.
D.  attach to a receptor on the bacterial cell membrane.

D is correct. The first step in the infection of a host is attachment of the phage tail to a specific receptor on thhost cell membrane. The capsid on the bacteriophage does not enter the host cell.

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