HIV-infected blood may be present on all of the following EXCEPT

a. toothbrushes.
b. razors.
c. needles used to inject drugs.
d. contaminated medical equipment.
e. toilet seats.


E

Biology & Microbiology

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Indicate whether the statement is true or false

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In which of the following is the presence of different mating types critical to sexual reproduction?

A. Sporangiospore-producing species B. Heterothallic species C. Homothallic species D. Arthrospore-producing species

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A stomach cell is producing pepsin, an enzyme that hydrolyzes proteins. Which of the following events suggests that gene expression of pepsin has been turned off in the cell?

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Single-celled eukaryotes lacking a cell wall are

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Biology & Microbiology