Question

question 30
what is the proton-motive force?
○ the energy required to remove an electron from a hydrogen atom
○ the energy provided by a transmembrane hydrogen ion gradient
○ the energy that moves hydrogen into the intermembrane space
○ the energy that moves hydrogen atoms into the mitochondrion

Explanation:

1. Analyze Option 1: The energy to remove an electron from a hydrogen atom is ionization energy, not proton - motive force.
2. Analyze Option 2: Proton - motive force is the energy associated with a transmembrane gradient of hydrogen ions (protons). This gradient has both a chemical (concentration) and an electrical component, and it provides the energy for processes like ATP synthesis in mitochondria and chloroplasts.
3. Analyze Option 3: The movement of hydrogen into the intermembrane space is part of creating the proton gradient, not the proton - motive force itself. The proton - motive force is the energy stored in the gradient.
4. Analyze Option 4: The proton - motive force is not about moving hydrogen atoms into the mitochondrion. It is related to the proton (hydrogen ion) gradient across a membrane.

Answer:

B. the energy provided by a transmembrane hydrogen ion gradient