Question

Why cell wall spirogyra is semipermeable not selectively permeable?

Answer 1

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Here is you ans

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Higher level organisms like animals do not have a cell wall, just a cell membrane. For these cells, the cell membrane also manages the movement of water, CO2 and oxygen in and out of the cell, and for all plant and animal cells the membrane is usually "selectively" permeable to specific preferred ions and organic molecules, and has lipid-protein complexes embedded in it to assist in the transfer of other molecules into the cell that the membrane is not initially permeable to. In this sense, a cell membrane is semi-permeable as well.

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