alleryStart learning →What is a concentration gradient?
AA charge difference across a membrane
BA pump that moves ions against a gradient
CA protein channel filled with water
DA space holding a range of concentrations
Answer & Solution
Correct answer: D. A space holding a range of concentrations
1. A physical space in which there is a range of concentrations of a single substance has a concentration gradient.
2. Put more simply, it is an area of high concentration next to an area of low concentration.
3. A difference of charge across the membrane is an electrical gradient, which is a separate thing.
4. Pumps and channels are proteins that respond to gradients rather than being gradients themselves.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 5 "Structure and Function of Plasma Membranes", section 5.2 Passive Transport_
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