What is the purpose of protonephridia in flatworms?
a. To sense prey
b. To exchange gas
c. To respond to stimuli
d. To regulate fluid balance
e. To serve as a structure for sexual reproduction
d
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Which form(s) of nitrogen is(are) unusable by plants?
a. ammonium b. nitrates c. nitrogen gas d. More than one of these answers is correct.
Mendel crossed true-breeding plants having yellow peas with true-breeding plants having green peas. The resulting
plants all had yellow peas. An F1 cross resulted in 3/4 of the plants having yellow peas and 1/4 of the plants having green peas. What does this tell you about the alleles for color?
a. yellow is usually the dominant color, but sometimes green can be dominant b. green is the dominant color c. yellow is the dominant color d. yellow is the recessive color e. yellow and green are codominant
A colony of mice is treated with a noninfective form of the bacterium Streptococcus pneumoniae. A
researcher exposes this noninfective form to heat-killed cells of an infective strain. The bacterial cells are said to be:
a. transduced. b. artificially transformed. c. transformed. d. noninfectious. e. conjugated
What was the researchers' conclusion in the "ant plant" studies?
A. Nectar attracts herbivores and prevents them from eating the leaves. B. Tramp ants eat the leaves of plants with domatia. C. Any ants that occupy domatia protect the trees from herbivores. D. Herbivores are more likely to eat the leaves of plants with domatia. E. Tramp ants that occupy domatia protect the trees from herbivores.