An enzyme's activity is significantly reduced outside its optimal pH range. This is primarily due to:

A Increased substrate concentration

B Denaturation of the active site

C Formation of more enzyme-substrate complexes

D Decreased activation energy

✓ Correct Answer: Option B

Extreme pH values can alter the ionic bonds and hydrogen bonds maintaining the enzyme's tertiary structure, leading to a change in the active site's shape (denaturation) and reduced activity.

💡 Why is B) the correct answer?

The correct answer to the question "An enzyme's activity is significantly reduced outside its optimal pH range. This is primarily due to:" is Option B: Denaturation of the active site.

The other options — A) Increased substrate concentration, C) Formation of more enzyme-substrate complexes, D) Decreased activation energy — are incorrect for this IB Exam Prep question. As explained above: Extreme pH values can alter the ionic bonds and hydrogen bonds maintaining the enzyme's tertiary structure, leading to a change in the active site's shape (denaturation) and reduced activity.

📚 About This IB Exam Prep Practice Question

This 3-level IB Exam Prep question from the Biology topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free IB Exam Prep practice test or use flashcards for spaced repetition review.

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An enzyme's activity is significantly reduced outside its optimal pH range. This is primarily due to:

✓ Correct Answer: Option B

📚 About This IB Exam Prep Practice Question

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