The descending arm of the loop of Henle is permeable to ____ but impermeable to ____
a. water; potassium ions
b. water; sodium ions
c. sodium ions; water
d. potassium ions; water
e. all choices are incorrect
ANSWER: b
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Indicate whether the statement is true or false.
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A) recruit RNA polymerase. B) form dimers with other transcription factors. C) bind a specific sequence in the major groove of DNA. D) unwind the double helix.
Diffusion of water from a hypertonic solution to a hypotonic solution across a semi-permeable membrane ____
a. will occur until both solutions are isotonic b. will occur until both sides are hypotonic c. will occur until both sides are hypertonic d. will occur until the tonicities are reversed e. will not occur
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