Cell Size. Unit 3 Part 2 – The Cell. Why are cells small?. Why cells are small? Diffusion limits cell size DNA limits the cell size. Surface area-volume ratio. Diffusion Limits Cell Size.
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Unit 3 Part 2 – The Cell
Cell size vs. surface area must remain at an efficient ratio
Growth - bigger organism needs more cells
Repair - regeneration of skin, blood & bone etc.
Reproduction - asexual vs sexual