Question

multiple choice question
if a solute is more concentrated in one location than another, it forms
an enzyme - substrate complex.
a concentration gradient.
activation energy.
a membrane.
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Explanation:

A concentration gradient occurs when a solute is more concentrated in one area compared to another. An enzyme - substrate complex is related to enzyme - catalyzed reactions, activation energy is the energy needed to start a reaction, and a membrane is a structure that can separate areas but is not formed by solute concentration differences.

Answer:

B. a concentration gradient