Which complex in the electron transport chain is responsible for pumping protons

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Question: Which complex in the electron transport chain is responsible for pumping protons into the intermembrane space?

Options:

Correct Answer: Complex I

Solution:

Complex I (NADH dehydrogenase) pumps protons into the intermembrane space.

Which complex in the electron transport chain is responsible for pumping protons into the intermembrane space?

Which complex in the electron transport chain is responsible for pumping protons into the intermembrane space?

Step 1: Understand that the electron transport chain is a series of complexes in the mitochondria.
Step 2: Identify the role of each complex in the electron transport chain.
Step 3: Focus on Complex I, which is also known as NADH dehydrogenase.
Step 4: Learn that Complex I takes electrons from NADH and uses energy from these electrons.
Step 5: Recognize that this energy is used to pump protons (H+ ions) from the inside of the mitochondria to the intermembrane space.
Step 6: Conclude that Complex I is responsible for pumping protons into the intermembrane space.

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