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(D) $\Rightarrow$ The transport of substances is primarily regulated by the cell membrane because it is a selectively permeable membrane. It consists

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All of the above.

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(D) $\Rightarrow$ The transport of substances is primarily regulated by the cell membrane because it is a selectively permeable membrane. It consists of a lipid bilayer embedded with proteins and carbohydrates.$\Rightarrow$ Lipid-soluble substances diffuse through the membrane easily,while specific transport proteins (like porins) facilitate the movement of other small molecules.$\Rightarrow$ In contrast,the cell wall is a non-living,rigid structure that provides mechanical support and protection to the cell,but it does not regulate the selective transport of molecules into or out of the cytoplasm.

The plant cell cytoplasm is surrounded by both cell wall and cell membrane. The specificity of transport of substances is mostly across the cell membrane,because $..........$

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