Exam (elaborations)
AQA A Level Biology 4/5/6 mark questions & Answers(RATED A+)
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Many different substances enter and leave a cell by crossing its cell surface membrane. Describe how substances can cross a cell surface membrane. (5) - ANSWER1 (Simple / facilitated) diffusion from high to low concentration / down concentration gradient; 2 Small / non-polar / lipid-soluble mole...
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