Electron Transport Chain

Question 0

What is the final destination of the electrons cashed into the electron transport chain?

Answer 0

To oxygen -converts oxygen to water

Question 1

What does the electron transport chain control the fate of?

Answer 1

Nadh and fadh2 from the cac

-this is where it is “cashed in”

Question 2

Nadh->

Fadh2->

Answer 2

Nad and fad (oxidations)

• the electrons are pumped into electron transport chain
• it also pumps protons across the membrane

Question 3

[H+] in the intermembrane space vs mitochondrisl mstrix

Answer 3

Intermembrane space has high [H+]

Mitochondrial matrix has low [H+]

Question 4

Where does the electron transport chain take place

Answer 4

In the inner mitochondrial membrane

Question 5

Where are the protons pumped?

Answer 5

Out of the matrix and into the intermembrane space

Question 6

PH?

Answer 6

• higher pH means more basic
• matrix has a higher pH (lower H+concentration)
• intermembrane space has a lower pH (higher H+ concentration)

Question 7

Four major complex involved

Answer 7

• nadh hands his electrons off to complex 1
• —- converts him to nad
• complex 1 hands them to a carrier COENZYME Q (aka ubiquinone)
• coenzyme Q hands the electrons to complex 3
• Complex 3 gives the electrons to a carrier CYTOCHROME C
• cytochrome c gives electrons to complex 4
• complex 4 gives electrons to oxygen and makes h2o

Question 8

Which complex is involved in the pumping of protons?

Answer 8

Complex 1, 3 and 4

Question 9

Fadh2

Answer 9

Gives his electrons to complex 2

-complex 2 hands them to coQ and so on

Question 10

Which way would protons spontaneously flow?

Answer 10

• from the intermembrane space to the matrix
• from a higher concentration to a lower
• this causes adp to rotate converting adp into atp

Question 11

Who pumps more protons across? Nadh or fadh2

Answer 11

Theres three nadh so it has more

-nadh is worth more atp then fadh2 is