How does an enzyme work on a chemical reaction that occurs in a substrate?

Answer

An enzyme speeds up the chemical reaction by lowering the amount of energy needed to begin the reaction (activation energy).

Rationale

Enzymes function as biological catalysts by lowering the activation energy required for a reaction to proceed, allowing substrates to convert to products more quickly without being consumed or permanently changed.

Answer choices

• A. An enzyme speeds up the chemical reaction by lowering the amount of energy needed to begin the reaction (activation energy).

  Enzymes function as biological catalysts by lowering the activation energy required for a reaction to proceed, allowing substrates to convert to products more quickly without being consumed or permanently changed.

• B. An enzyme permanently changes the chemical structure of the substrate.

• C. An enzyme increases the amount of substrate available for the reaction.

• D. An enzyme raises the activation energy needed to start the reaction.