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What is an intermediate? the product of an enzymatic reaction, it is also the substrate for another, the enzyme that catalyzes the next reaction in a series, the product of an enzymatic reaction that is defective and therefore secreted, or a product that can help a bacterium complete a metabolic pathway.
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So i'll start the answer.
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It's a.
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When we talk about a metabolic pathway, it's not very often that you go from one to the other in a single step.
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You tend to have multiple steps.
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Each step might be catalyzed by an enzyme.
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So let's say you have a and you want e.
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And you can't make that immediate jump because e is quite a complex molecule, it's quite different to a.
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So instead you might go a to b and then from b to c to d and then to e.
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And here b, c and d would all be intermediates.
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So they're produced by a reaction and then then they go into another reaction as the reactant...