LESSON 10 : ETC (Electron Transport Chain)

Question 1

is used to drive the oxidation processes that lead to the phosphorylation of ADP to ATP

Answer 1

NADH and FADH2

Question 2

ETC occurs in the

Answer 2

inner membrane of the mitochondria

Question 3

ETC: Complex 1

Answer 3

• NADH enters here
• NADH is oxidized to NAD+
• NADH releases 2 e-
• hydrogen ions are pumped into the intermembrane space (IMS)
• Ubiquinone (Coenzyme Q, Q)accepts the 2 e- and is reduced to CoQH2 (QH2)

Question 4

ETC: Complex 2

Answer 4

• FADH2 enters here
• FADH2 is oxidized to FAD
• FADH2 releases 2 e-
• Not enough energy is generated to pump H+ another
• Ubiquinone accepts the 2 e- and is reduced to CoQH2 (QH2)

Question 5

ETC: Complex 3

Answer 5

• Delivery of electrons from CoQH2 to Cytochrome C (Cyt C)
• The oxidation of each CoQH2 causes more H+ to be pumped from matrix to the IMS

Question 6

ETC: Complex 4

Answer 6

• Cyt c gets oxidized and the electron pair are transferred to an oxygen molecule
• The now negatively charged oxygen molecules attract two H+ to create water.
• The oxidation of Cyt c causes more H+ to pumped to the IMS

Question 7

The release of energy causes H+ to be pumped from

Answer 7

the matrix to the intermembrane space