The diffusion constant for glucose in water is 0.70 ✕ 10−5 cm2/s. About how much time would it take to get significant diffusion across the following structures? Assume that glucose diffuses through cells and membranes as fast as it does through water. a)across a cell membrane 8 nm thick b)from the center of a eukaryotic cell 6µm in radius to the cell membrane c)across the wall of the human heart 2.5 cm in thickness d)from the cells in the center of the cactus to the photosynthetic cells on the surface of a barrel cactus if the cactus has a radius of 12 cm

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