Describethe role played by protein pumps during active transport in plants.

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Solution

In plantcells, active transport occurs against the concentration gradient,i.e., from a region of lower concentration to a region of higherconcentration. The process of active transport involves specificprotein pumps. The protein pumps are made up of specific proteinscalled trans-membrane proteins. These pumps first make a complex withthe substance to be transported across the membrane, using the energyderived from ATP. The substance finally gets liberated into thecytoplasm as a result of the dissociation of the protein–substancecomplex.

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Consider the following statements and choose the correct answer.

I. Carrier proteins are needed by both facilitated diffusion and active transport and are sensitive to inhibitors that react with the protein.

II. Different types of proteins present in the membrane play a major role in both active as well as passive transport.

III. The carrier proteins needed by facilitated and active transport are specific.

IV. There is no need of energy to pump molecule against a concentration gradient in active transport.

V. Transport rate reaches the saturation point when all the active proteins are used.

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