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Which one of the following is active transport?

General Knowledge 2019 CDS General Knowledge 2019 CDS 2019

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It is the movement of a substance against a diffusion gradient with the use of energy from respiration.

It is the movement of a substance against a diffusion gradient without the use of energy.

It is the movement of a substance along a diffusion gradient with the use of energy from photosynthesis.

It is the movement of a substance along a diffusion gradient with the use of energy from respiration.