NURSING EXAM QUESTIONS
MICROBIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is too difficult to observe their characteristics.
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They lack a nucleus.
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They are acellular and nonliving.
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They do not have any genes, which prevents genetic analysis.
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Detailed explanation-1: -Unlike cellular organisms, viruses do not have genes that are common to all species and so a single viral phylogenetic tree cannot be created.
Detailed explanation-2: -In a phylogenetic tree, the characteristics of members of taxa are inherited from previous ancestors. Viruses cannot be included in the tree of life because they do not share characteristics with cells, and no single gene is shared by all viruses or viral lineages.
Detailed explanation-3: -Viral Structure and Function Viruses are acellular, meaning they are biological entities that do not have a cellular structure. Therefore, they lack most of the components of cells, such as organelles, ribosomes, and the plasma membrane.
Detailed explanation-4: -They require the machinery of the host cell to reproduce. They do not possess any similarity with the other cells. They do not have any organelles and fail to perform metabolic activities. Therefore, viruses are not placed in any domains.
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.