Question

in metabolic pathways, the products of one enzymatic reaction may act as the ______ for the next step in the pathway.

coenzymes
apoenzymes
enzymes
substrates
cofactors

Explanation:

Analyze the definition of a metabolic pathway

A metabolic pathway is a series of sequential enzymatic reactions where the product of one reaction serves as the starting material (reactant) for the subsequent reaction.

Identify the role of the reactant in enzymatic reactions

In biochemistry, the reactant that binds to an enzyme and undergoes a chemical reaction is called a substrate. Therefore, the product of the first reaction becomes the substrate for the next enzyme in the pathway.

Evaluate the given multiple-choice options

• coenzymes: organic molecules that assist enzymes but are not the main reactants.
• apoenzymes: the protein portion of an inactive enzyme.
• enzymes: biological catalysts that facilitate reactions but are not consumed as reactants.
• substrates: the molecules upon which enzymes act. This matches the definition.
• cofactors: non-protein chemical compounds required for an enzyme's activity.

Answer:

• coenzymes
• apoenzymes
• enzymes
• substrates (Correct answer)
• cofactors