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
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Lichens can form from the symbiotic relationship between a photosynthetic bacterium and a fungus
Indicate whether the statement is true or false
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
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?
A) The pepsin protein is folded properly in the cytoplasm. B) The chromosome with the pepsin gene is tightly coiled. C) The pepsin mRNA leaves the nucleus and enters the cytoplasm. D) Activators and RNA polymerases are abundant in the nucleus.
Single-celled eukaryotes lacking a cell wall are
A) protozoa. B) fungi. C) algae. D) insects. E) water molds.