why is the cell membrane said to be a semipermeable membrane ?
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because some time semipermeable memb. work as permeability to the elements....
permeability means to allow any thing to transfer through it..
(like the railway station platform.)
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The membrane is selectively permeable because substances do not cross it indiscriminately. Some molecules, such as hydrocarbons and oxygen can cross the membrane. Many large molecules (such as glucose and other sugars) cannot
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