A) algae
B) fungi
C) cyanobacteria
D) viruses
Correct Answer: D
Solution :
Viruses are made up of nuclei acid (DNA or RNA) + protein. Cellular organisation (cell membrane, protoplasm, ribosomes, etc.) is not found. No metabolism occurs in viruses and hence, no enzymes are found (of course, some vises have a few enzymes which help them to penetrate the host).
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