Tay-Sachs disease is a caused by a mutation that ________
A) affects lipids
B) causes abnormal hemoglobin structure
C) causes excess mucus
D) causes blindness and retardation
E) can be diagnosed by using a karyotype
D
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Estradiol is a potent stimulator of vitellogenesis (yolk production) in egg-laying vertebrates. Increasing evidence suggests that many pollutants, for instance those derived from pulp mills, may mimic the actions of estradiol. If one were to place a sexually immature fish in water containing pulp mill effluents, what might you expect would occur?
A. The rate of vitellogenesis would decline. B. The rate of vitellogenesis would increase. C. The fish might reach sexual maturity sooner. D. The rate of vitellogenesis would decline and the fish might reach sexual maturity sooner. E. The rate of vitellogenesis would increase and the fish might reach sexual maturity sooner.
Old pine stumps are dug up, split into pieces and sold as "fatwood". Fatwood is used as a fire starter. Why is this done?
A. The wood in the stumps is porous and dry, thus it burns easily. B. The high concentration of volatile organic compounds makes the wood flammable. C. Pine bark does not absorb water and is flammable. Clarify Question What is the key concept addressed by the question? Gather Content What do you already know about pine? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Why does transcription occur in the nucleus and not in the cytoplasm in eukaryotes?
A) RNA cannot exist in the cytoplasm. B) DNA cannot leave the nucleus. C) Ribosomes cannot leave the nucleus. D) Codons are only found in the nucleus.
Which of the below is not one of the six dimensions of health?
a. emotional b. spiritual c. environmental d. stress