In oxidative phosphorylation, H⁺ ions from the intermembrane space of mitochondria to the mitochondrial matrix, which type of membrane transport is this?

• A. Simple diffusion
• B. Facilitated diffusion
• C. Active transport
• D. None of these

Answer: (B)

Verified step by step guidance

1. Understand the context: Oxidative phosphorylation is a process that occurs in the mitochondria, where ATP is produced using energy derived from the electron transport chain.
2. Identify the movement of H+ ions: In this process, H+ ions move from the intermembrane space to the mitochondrial matrix.
3. Consider the concentration gradient: H+ ions are moving against their concentration gradient, as they are typically more concentrated in the intermembrane space than in the matrix.
4. Determine the type of transport: Since the ions are moving against their concentration gradient, this process requires energy, which is characteristic of active transport.
5. Conclude the type of transport: The movement of H+ ions in oxidative phosphorylation is an example of active transport, as it involves the use of energy to move ions against their gradient.