As you walk between classes on your college campus, you notice squirrels busily burying acorns. You realize you are witnessing what ecosystem service?
A. Biological control
B. Pest control
C. Seed dispersal
D. Pollination
E. Erosion control
Answer: C
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A molecular clock is
A. a clock that uses atoms for accurate time keeping. B. an estimate of the rate of accumulation of genetic divergences between two populations. C. a tool used to identify the rate of mutation, and is the same for all genes. D. a tool for studying evolution that has no real-world applications.
A person is genotypically blood type A. However, this individual also does not produce the lipid to which N-acetylgalactosamine is added, so the lipid is therefore not expressed on the surface of erythrocytes. This situation is known as the Bombay phenotype. When tested, this person will appear to be blood type
A) A. B) B. C) AB. D) O.
Molecular clocks are based primarily on rates of
A. neutral mutations. B. favorable mutations. C. detrimental mutations. D. natural selection. E. horizontal gene transfer.
The anaerobe Clostridium difficule is controlled in low numbers in the large intestine by the resident microbiota. After a course of antibiotics it may multiple and cause disease. This is called
a. Parasitic infection b. Mutualistic infection c. Exogenous infection d. Opportunistic infection