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: -Viruses lack cellular framework and need the host cell to multiply (reproduce).
Detailed explanation-2: -Viruses reproduce inside a host cell. Viruses replicate by lysogenic and lytic cycle. In the lytic cycle, the virus attaches itself to the host cell and injects its DNA. The viral DNA begins to replicate and form proteins, using the host’s cellular metabolism.
Detailed explanation-3: -Viruses cannot replicate on their own, but rather depend on their host cell’s protein synthesis pathways to reproduce. This typically occurs by the virus inserting its genetic material in host cells, co-opting the proteins to create viral replicates, until the cell bursts from the high volume of new viral particles.
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.
Detailed explanation-5: -Viruses completely rely on their host’s cell energy and molecular machinery to enter, multiply, and exit for a new round of infection.