Question

Why viruses are called obligatory parasite?option
1. they are very dangerous 2. they cannot survive outside host cell 3.they do not have plasma.

Answer 1

Answer:

(2) they cannot survive outside host cell.

Explanation:

All viruses are obligate parasites; that is, they lack metabolic machinery of their own to generate energy or to synthesize proteins, so they depend on host cells to carry out these vital functions. Once inside a cell, viruses have genes for usurping the cell's energy-generating and protein-synthesizing systems.

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