For mitochondria that are active in respiration, indicate whether the movement of each of the following molecules into (I) or out of (O) the matrix is thermodynamically favorable. Your answer would be a four-letter string composed of letters I and O only, e.g. IOOI.
( ) O²
( ) H⁺
( ) ADP
( ) CO₂

Question

Quizplus · Accepted Answer

In mitochondria that are active in respiration, O² and ADP are constantly consumed to produce H₂O and ATP, respectively. This creates concentration gradients that favor the movement of these molecules into the organelle. The opposite is true for CO² which is generated inside the matrix in decarboxylation reactions of the citric acid cycle. Protons are actively pumped out of the matrix by the proteins of the electron-transport chain, and power ATP production when they move into the matrix down their electrochemical gradient.

For Mitochondria That Are Active in Respiration, Indicate Whether the Movement