(C) Porins are large $ \text{proteins} $ that form large pores in the outer membranes of the plastids, mitochondria, and some bacteria.They allow mole

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(C) Porins are large $ \text{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 the membrane.Therefore, porins are essentially $ \text{proteinaceous} $ channels.