Concentration gradients can form across a cell membrane because?

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Concentration gradients can form across a cell membrane because?

A. entropy favors concentration gradients
B. membranes are selectively permeable
C. the cell membrane is soluble
D. oxygen can pass through the cell walls

2007-03-27 12:06:28 · 2 answers · asked by !*! 2 in Science & Mathematics ➔ Biology

2 answers

B.

Membranes are selectively permeable and, by use of diffusion, active transport, facilitated diffusion and a few other things, a concentration gradient is created and maintained.

2007-03-27 12:49:02 · answer #1 · answered by HP 2 · 0⤊ 0⤋

I believe it is B.

2007-03-27 19:12:13 · answer #2 · answered by pinkbeagle 4 · 0⤊ 0⤋