Facilitated diffusion across a biological membrane requires ______ and moves a s

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Facilitated diffusion across a biological membrane requires ______ and moves a s

Facilitated diffusion across a biological membrane requires ______ and moves a substance ______ its concentration gradient.
A) energy... down
B) transport proteins... down
C) energy and transport proteins... against
D) transport proteins... against

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mikael Author

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Thanks, you were right Smiling Face with Open Mouth

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