Which of the following cell organelle is rich in catalases?: (A) Mitochondria, (B) Ribosome, (C) Peroxisome, (D) Cell membrane
Answer is C. Peroxisomes are 0.5 m in diameter, are surrounded by a membrane, and contain enzymes that can either produce H2O2 (oxidases) or break it down (catalases). Ref: Ganong's Review of Medical Physiology 23rd edition, Chapter 2.