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3. Describe the role played by protein pumps during active transport in plants.

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Protein pumps are carrier proteins which take part in the transport of solutes across the cell membrane with the help of energy in the form of ATP even against a concentration gradient. On being activated with energy, the protein pump picks up solute particles from outside and transport them to the inner side into the cytoplasm. There are a number of protein pumps such as Na- K pump, Ca pump

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