A mutation in the MAOA gene is associated with ____ behavior
a. depressive
b. risk-taking
c. violent
d. schizophrenic
e. bipolar
c
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In class switching in the secondary antibody response, the most common antibody switch is from
A) IgA to IgD. B) IgD to IgE. C) IgM to IgG. D) None of the answers are correct.
Pseudocoelomate nematodes lack a body cavity.
A. Correct, their pseudocoel does not allow for the development and expansion of organs. B. Incorrect, their body cavity is fully enclosed by ectoderm but is a functional body cavity. C. Correct, they are solid from the gut to the cuticle. D. Incorrect, although not fully enclosed by mesoderm the pseudocoel is a body cavity.
During what period did one of the greatest extinctions of mammals occur?
A) Cretaceous B) Permian C) Pleistocene D) Carboniferous
Humans become infected with Toxoplasma gondii primarily by
A) being bitten by a tick. B) direct skin penetration. C) ingesting food or water contaminated with cysts. D) ingesting meat containing the parasite. E) intimate contact with another person.