Viagra is a drug used to treat erectile dysfunction by dilating arteries in the penis. The neurotransmitter that Viagra affects is
A. histamine.
B. acetylcholine.
C. serotonin.
D. nitric oxide.
Answer: D
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Genes present only on the X chromosome are called ________
A) sex-linked genes B) male genes C) female genes D) These genes do not have a special name.
One component of a veterinary software program may include the vaccine history
Indicate whether the statement is true or false
Dialysis uses the process of ________.
A. secondary active transport B. facilitated diffusion C. primary active transport D. simple diffusion
Does potassium permanganate diffuse more rapidly through water or through agar gel? Why?
A) It diffuses more rapidly through agar, because there are channels in agar that help the dye solution to move. B) It diffuses more rapidly through agar, because water attracts the dye molecules and slows their movement. C) It diffuses more rapidly through water, because there are no particles to slow the movement of dye. D) It diffuses more rapidly through water, because there are more particles for the dye to bounce off of.