Sometimes the immune system overreacts from exposure to a normally harmless substance such as cat hair. Subsequent exposure to this allergen elicits a massive inflammatory response. Because the chemical histamine is the cause of this inflammation, what
cell type is most likely behind the problem?
A) monocytes B) lymphocytes C) neutrophils D) basophils
Answer: D
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Deep-sea vent bacteria do not rely on the sun as a source of energy
Indicate whether the statement is true or false
Proximity of capillaries to tissue cells is crucial
because a. bulk flow operates to move protein-free plasma through clefts between endothelial cells. b. red cells have to squeeze single file through capillaries. c. some proteins exit capillaries by endocytosis and exocytosis. d. diffusion is a slow process. e. all of these are true.
Why does a replication fork have a leading and lagging strand?
A. Both answer choices of DNA synthesis proceeding from 5' to 3', and DNA polymerase acting on the 3' end, are correct. B. DNA synthesis always goes from 3' to 5'. C. DNA synthesis always goes from 5' to 3'. D. DNA synthesis can grow off of either the 3' or 5' end. E. DNA polymerase only attaches nucleotides to the 3' end of strands.
To date, the preferred weapons of mass destruction for terrorists have been:
A) nuclear. B) chemical. C) explosive. D) biologic.