A current news story describes a cruise ship in the Caribbean with an outbreak of diarrheal illness, affecting hundreds of people. With all of those people in a small area, opening and closing doors, using handrails, etc, you are trying to figure out what infectious agent may be the cause. Your most likely guess is that the pathogen is ________.
A. Clostridium difficile
B. shiga-toxin-producing E. coli
C. cholera
D. hepatitis B
E. norovirus
Answer: E
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Which of the following would not alter a gene's frequency in a population?
A) Mutation B) Migration C) Random mating D) Inbreeding
Bird song
a. has to be heard before a bird can sing it. b. is learned during early life. c. is specific for each bird species. d. has a genetic component. e. includes all of these.
A colony of termites was exposed to an atmosphere of 100 percent oxygen for three days. The insects were not immediately harmed by the treatment, but the protozoa that lived in the termites' guts were eliminated. The treated termites continued to behave normally and to eat wood, but they began to starve after a short time. When the treated termites were instead fed wood contaminated with the feces of untreated termites, the treated termites regained the ability to digest wood and no longer starved. The best analysis of the results of the experiment is that
(A) infection with protozoa causes the termites to switch to fermentation (B) cooperative interactions between the termites and the protozoa allow termites to extract energy from wood to survive (C) the termite immune system eliminates protozoa from the gut (D) termites digest protozoa as their main source of energy
Homo rudolfensis's brain volume is
A. 1000 cm3. B. 400-550 cm3. C. 680 cm3. D. 750 cm3.