Porins are proteins that form huge pores in the outer membranes of the plastids,mitochondria,and some bacteria. Which of the following molecules can pass through them?

  • A
    Molecules as large as lipids
  • B
    Molecules as large as proteins
  • C
    Both $(A)$ and $(B)$
  • D
    Molecules as large as $ATP$

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Select the correct statement regarding the cell membrane.

Identify the structures marked as $A, B, C$ and $D$ with respect to the fluid mosaic model of the plasma membrane.

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