单选题
Plant guard cells(保卫细胞) have a higher [C1-] than the outside environment. The most likely explanation for this is( ).
A、
Water leaves the cell by osmosis.
B、
C1- is diffusing through transmembrane channels.
C、
C1- diffusion is aided by a mobile carrier.
D、
An active transport symport transports C1-/H+.
E、
None of the above
【正确答案】
D
【答案解析】
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