What is the general effect of humans on the nitrogen (N) and phosphorus (P) cycles?
A. We greatly increase levels of N and P
through the burning of fossil fuels.
B. We cause levels of N and P in the
environment to drop through our farming
practices.
C. We overuse N and P in our farming
practices and cause high levels to enter the
natural environment.
D. We deplete levels of N and P in our
farming practices and do not replenish them.
C
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Which of the following regions of the human brain is critically important for monitoring and controlling movements?
A. medulla oblongata B. cerebellum C. hypothalamus D. basal nuclei E. cerebral cortex
During cell division the progeny of a trypanosome express a different VSG gene than their parents. Why is this done?
A. To hide from the host's immune system. B. To signal endocytosis of the parasites. C. VSG genes inhibit phagocytosis. D. VSG genes activate photoheterotrophy.
If a male cat with orange fur produces female offspring with calico fur, what color was the mother cat?
A. orange B. black C. calico D. black or calico E. orange or calico
Antibiotic resistance in bacteria develops primarily due to
A) Random mutation B) Horizontal gene transfer C) Metabolic changes D) Induction by host cells