Why are viruses called obligate intracellular parasites?

a) They must use a host cell's amino acids to synthesize proteins.
b) They must use a host cell's nucleotides for transcription and replication.
c) They must use a host cell's metabolic enzymes and pathways to obtain energy.
d) They must use a host cell's ribosomes to synthesize proteins.
e) All of the above.


Answer: e) All of the above.

Biology & Microbiology

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Indicate whether the statement is true or false.

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Which of these five evolutionary forces is rare and usually not considered by population geneticists?

A. mutation B. selection C. non-random mating D. genetic drift E. immigration

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The difference between the terms pathogenicity and virulence is that

A. pathogens cause disease and their virulence describes the degree of pathogenicity. B. virulent organisms cause disease and their pathogenicity describes the degree of disease manifestations. C. virulent organisms cause disease, pathogens do not. D. pathogenic organisms cause disease, virulent organisms do not.

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Which organ system removes nitrogen-containing waste products from blood?

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