BIOLOGY IN HUMAN WELFARE
HUMAN HEALTH AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A virus becomes living when in contact with a host organism.
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A virus infects a host organism by injecting its DNA into the cells of the host organism.
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A virus infects a host organism by pulling the DNA from the cells of the host organism into itself.
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A virus becomes living when a sufficient number of viruses invade a host organism and cause an infection.
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Detailed explanation-1: -Q. Which best explains how a nonliving virus is able to reproduce? A virus becomes living when in contact with a host organism.
Detailed explanation-2: -Viruses are not made out of cells, they can’t keep themselves in a stable state, they don’t grow, and they can’t make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.
Detailed explanation-3: -A virus infects a host organism by pulling the DNA from the cells of the host organism into itself.
Detailed explanation-4: -A virus is an infectious particle that reproduces by “commandeering” a host cell and using its machinery to make more viruses. A virus is made up of a DNA or RNA genome inside a protein shell called a capsid.
Detailed explanation-5: -Viruses also lack the properties of living things: They have no energy metabolism, they do not grow, they produce no waste products, and they do not respond to stimuli. They also don’t reproduce independently but must replicate by invading living cells.