Which of the following characteristics is/are true for a virus?
I. It has a nucleus.
II. It reproduces only in living cells.
III. It contains either DNA or RNA.

Options

A. I only
B. I and III
C. II and III
D. I, II and III

Answer

C

Explanation

Virus is a particle that is too small to be seen with a light microscope or to be trapped by filters but is capable of independent metabolism and reproduction only within a living cell. It consists of a core of nucleic acid (DNA or RNA) not nucleus surrounded by a protein coat. Thus they are also called as infectious nucleoprotein particles.