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Question

Porins are proteins with _____ pores which allow the movement of _____ proteins


A
Small , small
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B
Large , variously sized
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C
Large, large
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D
Small, large
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Solution

The correct option is D Large , variously sized
Porins are located in the outer membrane of Gram-negative bacteria and they function to form a water-filled pore through the membrane, from the exterior to the periplasm. The porin channel allows the diffusion of small hydrophilic molecules. The size limit of the permeable molecules is determined by the diameter of the channels.
So, the correct option is 'small , small'.

Biology

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