BIOLOGICAL CLASSIFICATION
VIROIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They do not require the use of a hosts replication machinery, but can use it
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They are unable to use a hosts replication machinery to reproduce
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They have to use a hosts replication machinery to reproduce
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They usually use a hosts replication machinery, but don’t need to.
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Detailed explanation-1: -Obligate intracellular parasites cannot reproduce outside their host cell, meaning that the parasite’s reproduction is entirely reliant on intracellular resources.
Detailed explanation-2: -Viruses are small and relatively simple microbes that cannot grow outside of living cells, that is, they are obligate intracellular parasites (Figure 1).
Detailed explanation-3: -The parasite that depends entirely on its host is called an obligate parasite whereas the parasite that does not rely entirely on a host is referred to as a facultative parasite. Because it is obligate parasitism, keeping the host “alive” is essential because the parasite needs the host for its growth and reproduction.
Detailed explanation-4: -Viruses infect a cell, take the machinery of the cell and replicate. Hence, they are intracellular obligatory parasites.
Detailed explanation-5: -Viruses are obligate parasites in that they can only replicate within a living host cell. Thus the science of virology is largely dependent upon the requirement to be able to grow and propagate such host cells.