The porins are proteins that form large pores, allowing molecules up to the size of small proteins to pass through. They are found in:
A
Membranes of some bacteria
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B
Membrane of ribosomes
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C
Outer membranes of the mitochondria
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D
Outer membranes of the plastids
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Solution
The correct option is B Membrane of ribosomes The porins are proteins that form large pores in the outer membranes of the plastids, mitochondria and some bacteria. They allow molecules up to the size of small proteins to pass through.