In order to infect a cell, a virus must
A. have a special protein on its surface that can interact with a protein receptor on the surface of the host cell.
B. produce a special extension of its cytoplasm when it comes into contact with the appropriate host cell.
C. inject its protein into the cell while the nucleic acid remains attached to the host cell surface.
D. active burrow through the cell wall or cell membrane of the host cell to reach the cell's nucleus.
Answer: A
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