BIOLOGICAL CLASSIFICATION
VIRUSES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is a TRUE statement about the structure of viruses?
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Viruses contain DNA as their nucleic acid and are always round
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Viruses contain DNA or RNA and are always surrounded by an envelope
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Viruses always contain RNA and usually have tail fibers
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Viruses contain DNA or RNA and are always surrounded by a capsid
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Explanation:
Detailed explanation-1: -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-2: -So, the correct answer is ‘Without independent metabolism’.
Detailed explanation-3: -Viruses are smaller and simpler in construction than unicellular microorganisms, and they contain only one type of nucleic acid-either DNA or RNA-never both.
Detailed explanation-4: -Viruses are smaller than the bacteria. Viruses consists of a genetic material (DNA or RNA) as well as a protein coat. Viruses require the host cell to reproduce. They are inactive outside the host cell.
There is 1 question to complete.