Q.

Which one of the following features is absent in a virus?

A. reproduce within host cell
B. presence of cell wall
C. fully parasitic in nature
D. presence of either DNA or
Answer» B. presence of cell wall
Explanation: A virus has a simple structure. It has no internal cellular structure, no cell wall or cell membrane, just the protein coat that holds the string of nucleic acid. It is made only of a nucleic acid + a protein coat. A cell wall is a layer located outside the cell membrane found in plants, fungi, bacteria, algae, and archaea.
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