Mantled howler monkeys have been found to obtain most of their food from relatively rare trees, even though finding these trees takes much longer than finding common trees. Nutritional analyses of both rare and common trees found that the rare trees tended to be higher in protein and water, while the common trees tended to be higher in crude fiber and plant secondary compounds. What process would maintain this behavior in mantled howler monkey populations?
A. habituation
B. natural selection
C. imprinting
D. visual communication
E. sexual selection
B. natural selection
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Fossils older than ____ cannot be dated by their 14C content because ____
a. 60,000 years; most of the 14C has decayed by this time b. 12,000 years; half of the 14C has decayed by this time c. 6,000 years; older fossils do not contain carbon d. 2,000 years; most of the 14C has decayed by this time e. 500 years; half of the 14C has decayed by this time
If infection primarily involves the outermost layers of adult amphibian skin, and if the chytrids use the skin as their sole source of nutrition, then which term best applies to the chytrids?
A) anaerobic chemoautotroph B) aerobic chemoautotroph C) anaerobic chemoheterotroph D) aerobic chemoheterotroph
A microbiologist suspects a strain of Staphylococcus aureus is resistant to methicillin. What would be the best approach to test this suspicion?
A. Perform a Gram stain. B. Add methicillin to the growth plates. C. Inject the bacteria into a host animal and look for disease symptoms. D. Calculate the doubling time for the bacteria. E. Sequence the chromosome looking for resistance genes.
Some genes in bacteria are repressed by antisense RNA that binds to them.
Answer the following statement true (T) or false (F)