GCSE AQA combined science- biology 0.0 / 5 ? ScienceBiologyGCSEAQA Created by: BobbycarCreated on: 26-09-19 10:33 give two differences in structure between bacterial and animal cells any two from: they're smaller/ bacterial cells don't have mitochondria/bacteria don't have a nucleus 1 of 9 an onion cell is 0.075 mm wide. the image of the cell is 7.5mm wide. what magnification was used to view the cell? x100 2 of 9 why might you add a stain to the slide? to be able to see the cells easier 3 of 9 describe how a root hair cell is specialized for its function. they have 'hairs', to give a big surface area 4 of 9 describe the events of the cell cycle that need to occur before mitosis can begin. cell grows, increases the amount of sub-cellular structures 5 of 9 how can stem cells help preserve rare plant species? (2 marks) clones, crop plants that are useful to farmers, e.g can't be killed by disease 6 of 9 explain how the surface area of a membrane affects diffusion the larger the surface area of the membrane, the faster the diffusion rate. this is because molre particles can pass through at the same time. 7 of 9 what is osmosis? the movement of water molecules from an area of high concentration to low concentration across a semi-permeable membrane 8 of 9 what is active transport? when a substance is absorbed from an area of low concentration to high concentration against the concentration gradient. 9 of 9
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