A class I MHC protein presents an antigen. What type of cell is likely presenting and to what type of cell would it be presented?
a. Any nucleated cell would be presented to a CD8 cell.
b. Any nucleated cell would be presented to a CD4 cell.
c. An antigen-presenting cell would be presented to a T helper cell.
d. An antigen-presenting cell would be presented to a CD4 cell.
Answer: a. Any nucleated cell would be presented to a CD8 cell.
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A small decrease in seawater pH was shown to have a significant effect on ____
a. climate change b. the oceanic sink for carbon dioxide c. gene expression in sea urchin larvae d. genes expression in zooplankton e. carbon dioxide accumulation in the ocean
Which of the following is associated with mollusks?
a. mantle b. pedicle c. spicule d. pistil
Observing a patient in the hospital, you notice that the patient requests extra food at most meals, but has a low BMI and housekeeping frequently finds vomit on towels in the patient's room. You would diagnose
A. anorexia nervosa. B. morbid obesity. C. copious intake. D. hypoglycemia. E. bulimia.
Many flower traits are specifically attractive to a certain type of pollinator. For example, the scent of rotting flesh is attractive to certain flies and beetles but not to most other pollinators. What adaptive purpose is served by this kind of "niche
marketing" of flowers to specific pollinators? A) This adaptation works to reduce pollinator traffic at a flower. Therefore, flowers do not have to produce as much nectar to feed big crowds of pollinators. B) This adaptation reduces pollinator traffic so that flowers have a chance to develop their pollen fully before it is spread. C) This targeting is done because the wrong kind of pollinator might eat all the pollen instead of delivering it to another flower. D) This adaptation helps to assure that pollen will be delivered to another flower of the same species. If less specialized pollinators are used, the odds are greater that pollen will wind up on the stigma of a different species.