Apentix/AP Biology/Unit 2: Cell Structure and Function/Question
AP Biologymediummcq1 pt

The inner mitochondrial membrane folds into cristae. How do these folds increase the rate of ATP synthesis?

A.They enlarge the surface area holding electron transport chain proteins and ATP synthase
B.They store extra oxygen to serve as the final electron acceptor
C.They separate mitochondrial DNA replication from transcription
D.They seal the intermembrane space so protons cannot flow back to the matrix

Explanation

Core Concept

Cristae fold the inner membrane, so a compact organelle carries far more membrane area. Because electron transport chain complexes pump protons across this membrane and ATP synthase sits embedded in it, added area packs more respiratory chains and synthase copies per mitochondrion, strengthening the proton motive force and raising the rate of chemiosmotic ATP synthesis.

Correct Answer

AThey enlarge the surface area holding electron transport chain proteins and ATP synthase

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 →