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Question

why carrier proteins are required for transfer of polar molecules through the bilayered lipid

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Solution

Transport across plasma membrane:

1. Passive transport − It does not require energy. Hence, neutral solute moves by diffusion, along the concentration gradient. Water moves through osmosis. Polar molecules cannot move through the lipid bilayer. It needs a Facilitated diffusion, and hence carried out by carrier proteins.

2. Active transport − It requires energy for transport against the concentration gradient.


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