When investigators exposed embryos of African
clawed frogs to lake-water samples from “hot spots,”
a. many of the tadpoles that developed had
deformities.
b. some resulting tadpoles never metamorphosed.
c. the effects could be reduced by adding
supplemental thyroid hormone.
d. all of these occurred.
e. none of these occurred.
Answer: d
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True-breeding red flowers are crossed with true-breeding white flowers, and all of the offspring are pink. What kind of inheritance is this?
a. codominance b. polyploidy c. incomplete dominance d. homozygous recessive
Cleavage divisions proceed at approximately the same rate in the embryo of _______, reflecting
uniform distribution of yolk.
a. bird b. human c. sea urchin d. frog e. sea urchin and human
When two species have overlapping niches and one species is excluded by the other, it is an example of
a. a fundamental niche. b. competitive inclusion. c. a realized habitat. d. intraspecific competition. e. competitive exclusion.
Which of the following is NOT a possible function of magnetosomes?
A) Get cells to the North Pole B) Protect cells from hydrogen peroxide accumulation C) Store iron D) Locate suitable environments