The epidermal growth factor-Ras signaling pathway stimulates increased expression of each of the following except
A) MAPK.
B) Jun.
C) Fos.
D) Myc.
E) The pathway turns on expression of all of the above.
Answer: A
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What would happen if an enzyme inhibitor for the enzyme photodiesterase (PDE) was applied to a vertebrate eye?
A) The opsins found in cones would not be differentiated into the red, blue, and green proteins, causing the animals to be color blind. B) The cGMP-gated sodium channels would remain open, glutamate would be continuously discharged at the synapses, and the brain would not detect light absorbed by the rod cells. C) The lens could not be appropriately adjusted to focus light on the retina, resulting in either nearsightedness or farsightedness. D) All of the listed responses are correct.
The leaves of ferns are called
a. epiphytes. b. stems. c. fronds. d. bracts. e. rhizomes
The source of glucocorticoids is the
a. pituitary gland. b. adrenal cortex. c. adrenal medulla. d. thymus gland. e. thyroid gland
The sea heats and cools
A. three times a day. B. more quickly than the land and more slowly than the land. C. more quickly than the land. D. more slowly than the land. E. at the same rate as the land.