Enzymes accelerate reaction rates by lowering activation energy

Steps:

• Identify the solid line as baseline product formation rate without enzyme.
• Recall enzymes speed up reactions, increasing product accumulation over time.
• Compare dashed lines: select the one showing steeper initial slope and faster rise to plateau.
• Confirm the chosen line reaches maximum product quicker than baseline.

Why A is correct:

• Line A has a higher initial rate, matching enzyme catalysis that reduces activation energy per transition state theory.

Why the others are wrong:

• B shows slower rate, indicating inhibition, not catalysis.
• C matches baseline, showing no enzyme effect.
• D plateaus lower, suggesting incomplete reaction or side effects.

Final answer: A