Apentix/AP Biology/Unit 2: Cell Structure and Function/Question
AP Biologyeasymcq1 pt

Fatty acid breakdown in certain organelles generates hydrogen peroxide, a compound that would poison the cytosol if it accumulated. Which organelle both produces this byproduct and destroys it on the spot?

A.The lysosome, whose acidic lumen neutralizes peroxide
B.The mitochondrion, which burns peroxide for extra ATP
C.The peroxisome, where catalase splits hydrogen peroxide into water and oxygen
D.The smooth endoplasmic reticulum, which stores peroxide for signaling

Explanation

Core Concept

Peroxisomes carry out oxidative reactions that can generate hydrogen peroxide and also contain enzymes such as catalase that convert H2O2 to water and oxygen. Compartmentalizing both production and detoxification limits exposure of the rest of the cell. It is too strong to say no H2O2 ever leaves a peroxisome; cellular H2O2 can also participate in redox signaling when present at controlled levels.

Correct Answer

CThe peroxisome, where catalase splits hydrogen peroxide into water and oxygen

More Unit 2: Cell Structure and Function practice questions

Try a random question →

Practice more AP Biology questions with full explanations

Practice Unit 2: Cell Structure and Function Questions →