Lysosomes

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Lysosomal enzymes optimally function at which pH range?

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1. **Identity**: Lysosomes are 'suicide bags' containing over 40 types of hydrolytic enzymes (proteases, nucleases, lipases, glycosidases).
2. **Activation**: These enzymes are termed **acid hydrolases** because they perform best in an acidic environment.
3. **Internal pH**: The lumen of the lysosome is maintained at a **$pH \approx 5.0$** by proton pumps in its membrane.
4. **Safety Mechanism**: If a lysosome ruptures, its enzymes become inactive or significantly less active in the neutral cytosol ($pH \approx 7.2$), protecting the cell from accidental self-digestion.

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Lysosomes

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