Biology - oxidative phosphorylation

posted by .

Some things I don't understand:

If oxygen accepts electrons from the electron transport chain, how does it become a molecule of water? ie where does the hydrogen come from?

In chemiosmosis, protons are pumped against their concentration gradient across the inner mitochondrial membrane to create a pH gradient which then powers ATP synthesis. But doesn't the initial pumping out of protons use ATP?

  • Biology - oxidative phosphorylation -

    The hydrogen ions are pumped into the intermembrane space from the mitochondrial matrix. Oxygen captures the electrons in the very last step in the electron transport and adding electrons to that oxygen atom and two hydrogen ions form water.

    No. ATP synthase transports hydrogen ions and it's powered by the flow of hydrogen ions back across the membrane. Those backed-up hydrogen ions will give up their energy when they diffuse through a special protein in the membrane (ATP synthase). That pH gradient will power the pumping - not ATP.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Biology

    During aerobic respiration, electrons travel downhill in which of these sequences?
  2. CHEMISTRY

    What is the geometric structure of the water molecule?
  3. Biology

    What role do high-energy electrons play in the electron transport chain?
  4. Science

    How does the movement of electrons and protons create large amounts of energy in oxidative phosphorylation?
  5. biology help plz?????????????????

    product of The oxidative phosphorylation / electron transport is ?
  6. biology/chemistry

    Determine the net ATP production from one molecule of acetyl CoA through the citric acid cycle and taking the products through oxidative phosphorylation?
  7. Science Help!

    When two hydrogen atoms bond with one oxygen atom to form water, what happens to the electrons?
  8. Science

    When two hydrogen atoms bond with one oxygen atom to form water, what happens to the electrons?
  9. Science

    When two hydrogen atoms bond with one oxygen atom to form water, what happens to the electrons?
  10. biology/science

    Oxygen attracts electrons more strongly than hydrogen does. What kind of bond forms between the two hydrogen atoms and single oxygen atom that form a water molecule?

More Similar Questions