1.

Which one of the following is active transport?

A. It is the movement of a substance against a diffusion gradient with the use of energy from respiration.
B. It is the movement of a substance against a diffusion gradient without the use of energy.
C. It is the movement of a substance against a diffusion gradient with the use of energy from photosynthesis.
D. It is the movement of a substance along a diffusion gradient with the use of energy from respiration.
Answer» B. It is the movement of a substance against a diffusion gradient without the use of energy.


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