Module 2: Electron Transport Chain

Question 1

What is the electron transport chain

Answer 1

A series of protein complexes that use coupled redox reactions to create an electrochemical gradient

Question 2

What does the electrochemical gradient lead to

Answer 2

creation of ATP in oxidative phosphorylation

Question 3

What happens at complex 1

Answer 3

NADH in the matrix gives its electrons to complex 1 and then releases NAD+ and H+ ions, the energy from the redox reaction then pumps H+ into the inter-membrane space

Question 4

What happens after the step at complex 1

Answer 4

Coenzyme q takes the electrons that are still in the matrix and releases energy

Question 5

Complex 2?

Answer 5

is bypassed and goes straight to complex 3

Question 6

How do the electrons get to complex 3

Answer 6

Coenzyme q passes them from complex 1 to complex 3

Question 7

What happens at complex 3

Answer 7

Cyt C is reduced and complex 3 is oxidized, the energy produced from the redox reactions is used to pump H+ out into the inter-membrane space and send electrons to complex 4

Question 8

What happens at complex 4

Answer 8

passes the electrons to the terminal electron receptor

Question 9

What is the terminal electron receptor

Answer 9

Oxygen

Question 10

What happens with the terminal electron receptor

Answer 10

the oxygen combines with the extra H+ ions to produce H2O as a byproduct

Question 11

How is energy synthesized during chemiosmosis

Answer 11

The H+ ions go down the concentration gradient through a channel, the energy from this “Spins” proteins to synthesize ATP

Question 12

What is oxidative phsophorylation

Answer 12

The entire process of the electron transport chain and chemiosmosis (ATP synthase)