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3. The diagram shows a section through a mesophyll cell of a leaf
Which part is partially permeable?
A-
0
B-
D
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Answer:

B- the cell membrane

Explanation:

Cell membranes are made up of lipids, proteins and cholesterol. These make up a selectively permeable layer that only allows for the movement of few molecules across the cell surface.

The lipid layer only allows for the passage of small non-polar molecules, while larger molecules require transport proteins to ferry other substances into the cell.

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