Question

what is virus an exception to cell theory

Answer 1

Here your answer
an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host

Answer 2

Cell theory cell all living things are made up of cell, which is structural and functional unit of life. *Viruses are exception because viruses are alive only until they are inside their host cell. They are considered to behave dead when outside the host cell.