The tonoplast is

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(D) The tonoplast is the membrane surrounding the vacuole in plant cells.It is selectively permeable,meaning it allows the transport of specific ions

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Differentially permeable

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(D) The tonoplast is the membrane surrounding the vacuole in plant cells.It is selectively permeable,meaning it allows the transport of specific ions and other materials against concentration gradients into the vacuole,thereby maintaining the concentration of ions and other substances in the vacuole significantly higher than in the cytoplasm.Therefore,it is best described as differentially permeable.

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In plants,the tonoplast facilitates the transport of a number of ions and other materials:

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