Our most effective weapon against viral infections is

A. vaccinations.
B. antibiotics.
C. sulfa drugs.
D. surgery.
E. gene therapy.


A. vaccinations.

Biology & Microbiology

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The movement of substances to regions of lower concentration is called 

A. active transport. B. diffusion. C. pinocytosis. D. pumping. E. exocytosis.

Biology & Microbiology

When circulating ____ levels are too high, production of parathyroid hormone would be ____

A. calcium; inhibited B. calcium; stimulated C. glucose; inhibited D. glucose; stimulated E. cortisol; inhibited

Biology & Microbiology

Which of these is a correct difference between

roots and shoots?

a. roots lack a cuticle covering their epidermis-shoots have one b. roots have a protective cap around their apical meristem-shoots don’t have one c. roots grow down-shoots grow up d. shoots are photosynthetic-roots are not e. all of these are differences between roots and shoots

Biology & Microbiology

According to the Lotka-Volterra equations, which of the following is not an expected outcome of competitive interactions between two species?

A) Species 1 drives species 2 to extinction. B) Species 2 drives species 1 to extinction. C) Both species coexist. D) The populations of both species increase to infinity.

Biology & Microbiology