Biology

Question

State two reasons why some molecules can pass through a certain membrane, but other molecules can not.

2 Answer

  • The cell membrane has selective permeability and chooses which to pass through. Non polar molecules can pass easily with diffusion, but ions cannot.
  • Answer:

    Size and polarity

    Explanation:

    I can think of two reasons:

    1. Size — the molecules may be too big to pass through the pores of the membrane
    2. Polarity — polar molecules and ions cannot pass through a nonpolar membrane.

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