OBJECTIVE LIFE SCIENCE
CELL BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Viruses eat and metabolize food.
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Viruses reproduce only when inside a host cell.
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Viruses reproduce on their own at any time.
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Viruses contain DNA, so they are alive.
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Detailed explanation-1: -The correct option is B. Explanation for correct option: Viruses reproduce inside a host cell. Viruses replicate by lysogenic and lytic cycle .
Detailed explanation-2: -Since viruses are intracellular parasites, they rely on their host cells for the energy, macromolecular synthesis machinery and the work benches for genome replication and particle assembly.
Detailed explanation-3: -Which statement best explains why viruses can only reproduce within a host? Viruses lack the ribosomes necessary to make their own proteins.
Detailed explanation-4: -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. If an obligate parasite cannot obtain a host it will fail to reproduce. Q.
Detailed explanation-5: -The correct answer is B. Viruses do not eat food, but they live inside the cells of their hosts.