Peroxisomes—structure and function Which statements about peroxisomes are correct?

Introduction / Context:
Peroxisomes are small, single-membrane organelles that handle oxidative metabolism, particularly very-long-chain fatty acid oxidation and detoxification reactions.

Given Data / Assumptions:

• Peroxisomes possess a single lipid bilayer (unlike mitochondria or nuclei with double membranes).
• They house oxidases and catalase.
• Oxidative reactions yield hydrogen peroxide (H2O2), a reactive oxygen species.

Concept / Approach:
Evaluate each statement against textbook features of peroxisomes: single membrane, oxidative catabolism, and H2O2 production followed by detoxification via catalase.

Step-by-Step Solution:
Confirm boundary: peroxisomes are bounded by a single membrane.Confirm metabolism: contain enzymes for β-oxidation (organism-dependent spectrum) and amino acid oxidases.Confirm byproduct: H2O2 is generated and decomposed by catalase to water and oxygen.All three statements are true, so “All of the above” applies.

Verification / Alternative check:
Peroxisomal disorders (for example, Zellweger spectrum) disrupt these functions, underscoring the organelle’s roles.

Why Other Options Are Wrong:

• None of the above: Contradicted by well-established cell biology.

Common Pitfalls:
Confusing peroxisomes with lysosomes or mitochondria; mixing single vs double membranes.

Final Answer:
All of the above.