Cytotoxic T cells are involved in which of the following action(s)
I. Antigen presentation
II. Tumor destruction
III. Cell lysis of virus infected cells
A. I only
B. II only
C. I and II only
D. II and III only
E. I, II and III
Ans: D. II and III only
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Which of the following benefits to humans is NOT attributable to phenolics?
A. antioxidants in red wine B. the flavor of vanilla C. absorption of ultraviolet radiation D. the sweetness of honey E. the taste of chillies
The Earth's surface releases __________ that is absorbed by the atmosphere, stabilizing or raising atmospheric temperature.
A. gamma radiation B. ultraviolet radiation C. near-ultraviolet radiation D. x-rays E. x-ray radiation
In determining who should receive liver transplants, should lifestyle be a factor?
1.No, lifestyle factors should not be considered in transplant decisions because everyone should have an equal opportunity for a transplant. 2.Yes, lifestyle factors should be taken into account when determining who gets a transplant and people who have liver damage due to past behavior should be given a lower priority.
Lamprey populations introduced into the Great Lakes have grown dramatically. Why?
A) Competitive species have driven them from the ocean. B) Fishers have intentionally introduced them with the hope of farming them for "eel skin." C) They have no natural predators in these waters. D) Lamprey stocking programs have been highly effective. E) A fish species that they naturally prey upon has recently been introduced into the Great Lakes.