The enzyme that splits hydrogen peroxide into water and oxygen is:
**Question:** The enzyme that splits hydrogen peroxide into water and oxygen is:
A. Catalase
B. Glucose oxidase
C. Lipase
D. Lactate dehydrogenase
**Core Concept:** Hydrogen peroxide (H2O2) is a reactive oxygen species (ROS) that can cause cellular damage when present in high concentrations. Enzymes are proteins that act as biological catalysts, speeding up chemical reactions without being consumed in the process. One such enzyme that breaks down hydrogen peroxide is catalase.
**Why the Correct Answer is Right:** Catalase is a crucial enzyme found in cells that protects them from oxidative stress caused by hydrogen peroxide. Catalase decomposes hydrogen peroxide into water (H2O) and oxygen (O2) by breaking the H2O2 molecular bond, preventing cellular damage. This makes catalase the correct answer among the options provided.
**Why Each Wrong Option is Incorrect:**
A. Glucose oxidase is an enzyme involved in the detection and utilization of glucose, not the breakdown of hydrogen peroxide.
B. Lipase is an enzyme that catalyzes the hydrolysis of triglycerides, not the breakdown of hydrogen peroxide.
C. Lactate dehydrogenase is an enzyme involved in the Krebs cycle and gluconeogenesis, not the breakdown of hydrogen peroxide.
**Why the Correct Answer is Right:** The correct answer, catalase, is specific to breaking down hydrogen peroxide, whereas the incorrect options are involved in other enzymatic reactions and processes, not related to hydrogen peroxide decomposition.
**Clinical Pearl:** Catalase is vital for maintaining cellular homeostasis by neutralizing hydrogen peroxide, which can accumulate during oxygen consumption or hypoxia. Its deficiency can lead to high hydrogen peroxide levels causing cellular damage, as seen in heme peroxidases deficiency, a rare genetic disorder.
**Correct Answer:** A. Catalase