BIOLOGICAL CLASSIFICATION
VIRUSES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They do not have hereditary material (DNA).
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They are not separated from their environments.
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They lack an independent metabolism, so they need a host in order to reproduce.
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Their traits do not evolve in response to selection pressures.
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Detailed explanation-1: -They are acellular, that is, they contain no cytoplasm or cellular organelles. They carry out no metabolism on their own and must replicate using the host cell’s metabolic machinery. In other words, viruses don’t grow and divide. Instead, new viral components are synthesized and assembled within the infected host cell.
Detailed explanation-2: -Viruses do not contain ribosomes, mitochondria or other cell-like organelles, and are thus completely parasitic. Since they cannot replicate without the metabolic processes of the host cell, they are genetic parasites.
Detailed explanation-3: -A virus needs a living cell in order to reproduce. The living cell in which the virus reproduces is called a host cell.
Detailed explanation-4: -Viruses have several common characteristics: they are small, have DNA or RNA genomes, and are obligate intracellular parasites. The virus capsid functions to protect the nucleic acid from the environment, and some viruses surround their capsid with a membrane envelope.
Detailed explanation-5: -As viruses have no ribosomes, mitochondria, or other organelles, they are completely dependent on their cellular hosts for energy production and protein synthesis. They replicate only within cells of the host that they infect.