Lysosomes
Lysosomal enzymes optimally function at which pH range?
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About This Question
- Subject
- biology
- Chapter
- cell structure and function
- Topic
- lysosomes
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
~5.0
- Identity: Lysosomes are 'suicide bags' containing over 40 types of hydrolytic enzymes (proteases, nucleases, lipases, glycosidases).
- Activation: These enzymes are termed acid hydrolases because they perform best in an acidic environment.
- Internal pH: The lumen of the lysosome is maintained at a pH≈5.0 by proton pumps in its membrane.
- Safety Mechanism: If a lysosome ruptures, its enzymes become inactive or significantly less active in the neutral cytosol (pH≈7.2), protecting the cell from accidental self-digestion.
This medium difficulty biology question is from the chapter cell structure and function, covering the topic of lysosomes. It appeared in the 2025 exam.
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