Slime molds colonized land before plants and animals.
a. true
b. false
Ans: a. true
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Telomere shortening puts a limit on the number of times a cell can divide. Research has shown that telomerase can extend the life span of cultured human cells. How might adding telomerase affect cellular aging?
A) Telomerase will speed up the rate of cell proliferation. B) Telomerase eliminates telomere shortening and retards aging. C) Telomerase shortens telomeres, which delays cellular aging. D) Telomerase would have no effect on cellular aging.
Monod's group found that that appearance of ?-galactosidase correlated with that of galactoside permease. This ultimately led his group to the conclusion that:
A. constitutive expression involved two genes. B. ?-galactosidase production is contingent on the presence of galactosidase. C. the expression of ?-galactosidase and permease is under the control of another gene. D. a mutation in the ?-galactosidase gene would decrease expression of a permease gene. E. a mutation in the regulator gene would decrease expression of galactosidase and permease.
Calcium intake is important for women during pregnancy. If a woman for whatever reason does not get enough calcium in her diet during pregnancy, what is likely to happen to her bone tissue?
A) She will experience severe bone loss due to the loss of estrogen production during pregnancy. B) She may experience some bone loss due to the lack of calcium in her diet, but nothing significant. C) She may experience significant bone loss due to both the lack of dietary calcium and the fact that the fetus requires extra calcium, which will be removed from her own bone tissue. D) The fetus will be born without a skeleton.
Which of the following characteristics is associated with all animals that are bilaterally symmetrical at some point in their life cycle?
A) Cephalization B) Coelom C) Gastrovascular cavity D) Lack of organs E) Mesoderm