Discussion
Organic molecules that increase the rate of metabolic reactions without themselves being changed are known as
Answer: B
Correct answer: enzymes
Enzymes are catalysts: they speed a reaction by lowering its activation energy and emerge from it unchanged, ready to act again. That is why a small quantity turns over a great deal of substrate. Coenzymes assist enzymes but are altered in the reaction and must be regenerated; substrates and reactants are consumed.
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