5.6.4 Electron Transport Chain

Question 1

For every NADH molecule, how many ATP molecules are produced?

Answer 1

• 2.5ATP molecules are produced.

Question 2

For every FADH molecule, how many ATP molecules are produced?

Answer 2

• 1.5ATP molecules are produced.

Question 3

What reaction does NADH and FADH undertake straight away?

Answer 3

• Oxidation.

Question 4

What happens to the hydrogen atoms after they were oxidised?

Answer 4

• Dissociates into a proton and electron.

Question 5

What happens when electrons go through the electron carriers?

Answer 5

• Undergo a series of redox reactions.

Question 6

What happens to the energy as the electrons go through the ETC?

Answer 6

• They lose energy.

Question 7

What happens to the energy that has just been lost from the electrons?

Answer 7

• The energy is used to pump the protons through the inner membrane into the intermembrane space forming an electrochemical gradient.

Question 8

Describe the chemiosmotic theory?

Answer 8

• Protons diffuse back into the inner membrane space via ATP Synthase.

Question 9

What is the result of protons passing back through the inner membrane space?

Answer 9

• ATP is made from condensation of ADP + Pi.

Question 10

What happens to the leftover electron, proton and oxygen?

Answer 10

• Forms water.