Of the following proteins, which would be a good target for drug therapy if one needed to interfere with breaking down the microfilament network?
A) profilin
B) CapZ
C) gelsolin
D) tropomodulin
E) calmodulin
C) gelsolin
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All insertion sequences (IS elements) contain two features that are essential for their movement. What are these two elements?
A) transposase and oncogenes B) proto-oncogenes and oncogenes C) integrase and pseudogenes D) integrase and oncogenes E) transposase and inverted terminal repeats
When can photorespiration occur in plants?
A) when stomata are closed B) when oxygen levels inside the leaf are low C) when the plant is undergoing transpiration D) during the Calvin cycle
Why is an estuary considered an intermediate biome?
A) It is the transition zone between freshwater and saltwater biomes. B) It is intermediate in size, smaller than the largest biomes but larger than the smallest biomes. C) It will seasonally dry up and cease to be a biome. D) It is only a biome during high tide.
Which of the following statements concerning B cell receptors (BCRs) is FALSE?
A) They are formed in response to an encounter with an antigen. B) They are complementary in shape to a specific antigenic determinant that they may or may not encounter. C) They are bound to the surface of B lymphocytes and have two antigen-binding sites. D) Each B lymphocyte is randomly generated with antibody variable regions that determine its BCR. E) Scientists estimate that each person forms at least 1011 different types of B lymphocytes with distinct BCRs.