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Bhavesh Moradiya · Answer 1 · 2022-01-26T06:12:27+0000

cell membrane : decides what enters and leaves, it also decides which proteins come in and out
passive transport : passive transport uses energy and i’m pretty sure it’s a transport that allows only some proteins to go through such as proteins

Cropper · Answer 2 · 2022-01-29T20:12:16+0000

membranes are barriers and “gatekeepers”, they only let certain molecules pass through them.

they also transport nutrients to the cell

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