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AQA A LEVEL BIOLOGY PAPER 1 WITH QUESTIONS AND WELL VERIFIED ANSWERS[GRADED A+] NEW!!NEW!!!

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AQA A LEVEL BIOLOGY PAPER 1 WITH QUESTIONS AND WELL VERIFIED ANSWERS[GRADED A+] NEW!!NEW!!! What is the function of the cell membrane? - ANS---To control what enters and leaves the cell, acts as a barrier between the cell and its environment. What is the function of cholesterol in the CSM? - ANS---Make phospholipids pack more closely together, restricting the movement of the phospholipids, making the membrane less fluid/more rigid. What is simple diffusion? - ANS---The (passive) movement of particles from an area of high concentration to an area of low concentration. What is facilitated diffusion? - ANS---The passive movement of a large/charged particle down its concentration gradient through a carrier/channel protein.

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