Biology 9700 · AS & A Level · Movement into and out of cells

Movement into and out of cells — practice question

How many times does a molecule of oxygen need to cross a cell surface membrane as it diffuses from the air space inside an alveolus, through a cell in the capillary wall, before binding to a molecule of haemoglobin?

  • A3
  • B4
  • C5
  • D10

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