Bounded by double membrane (inner - cristae) produces ATP.

Bounded by double membrane (inner - cristae) produces ATP.

• A. Chloroplast
• B. Nucleus
• C. Mitochondrion
• D. Lysosome

Answer: (C)

This describes the mitochondrion, the organelle where most ATP is produced through oxidative phosphorylation. The inner membrane is folded into cristae, which greatly increases the surface area available for hosting the electron transport chain and ATP synthase. As electrons travel along the chain, protons are pumped across the membrane, creating a gradient. ATP synthase uses this proton motive force to synthesize ATP from ADP in the matrix. The matrix itself hosts the citric acid cycle, supplying NADH and FADH2 to drive the chain. While chloroplasts also generate ATP through photosynthesis, they have a different internal organization (thylakoids) and don’t rely on cristae. The nucleus and lysosome don’t produce ATP, so the mitochondrion is the best match for the description.

This describes the mitochondrion, the organelle where most ATP is produced through oxidative phosphorylation. The inner membrane is folded into cristae, which greatly increases the surface area available for hosting the electron transport chain and ATP synthase. As electrons travel along the chain, protons are pumped across the membrane, creating a gradient. ATP synthase uses this proton motive force to synthesize ATP from ADP in the matrix. The matrix itself hosts the citric acid cycle, supplying NADH and FADH2 to drive the chain. While chloroplasts also generate ATP through photosynthesis, they have a different internal organization (thylakoids) and don’t rely on cristae. The nucleus and lysosome don’t produce ATP, so the mitochondrion is the best match for the description.