12.3 oxidative phosphorylation

Question 1

where does oxidative phosphorylation take place

Answer 1

inner mitochondrial membrane

Question 2

step 1

Answer 2

hydrogen atoms donated by NADH from Krebs cycle

Question 3

step 2

Answer 3

hydrogen atoms split into protons and electrons

Question 4

step 3

Answer 4

high energy electrons enter the ETC and release energy as they move through the ETC

Question 5

step 4

Answer 5

the released energy is used to transport protons across the inner mitochondrial membrane from the matrix into the intermembrane space

Question 6

step 5

Answer 6

concentration gradient of protons is established between the intermembrane space and the matrix

Question 7

step 6

Answer 7

the protons return to the matrix via facilitated diffusion through ATP synthase channel protein

Question 8

step 7

Answer 8

the movement of protons down their concentration gradient provides energy for ATP synthesis

Question 9

step 8

Answer 9

oxygen acts as the final electron acceptor and combines with protons and electrons at the end of the ETC to form water