Enzymes lower activation energy without altering energy yield

Steps:

• Enzymes act as catalysts in biochemical reactions.
• Catalysts reduce the activation energy required to start the reaction.
• The overall free energy change (ΔG) of the reaction remains unchanged.
• Thus, reaction rate increases, but energy yield stays the same.

Why A is correct:

• Enzymes decrease activation energy (Ea) per transition state theory, speeding reactions without affecting ΔG, the net energy yield.

Why the others are wrong:

• B: Enzymes do not decrease energy yield; ΔG is invariant.
• C: Enzymes lower, not raise, Ea; ΔG unaffected.
• D: Enzymes do not increase energy yield; order reversed.

Final answer: A