Electron Transport Chain and Oxidative Phosphorylation

Question 1

describe the structure of a mitochondria from outside to inside (4)

Answer 1

1. outermembrane
2. inter membrane space
3. inner membrane
4. matrix

Question 2

what is found in the inner membrane of a mitochondria?

Answer 2

enzymes for electron transport and oxidative phosphorylation

Question 3

describe the matrix of mitochondria

Answer 3

location of metabolic processes

Question 4

can electron transport occur in all cells?

Answer 4

nope! only in cells with mitochondria

Question 5

can cells without mitochondria get energy from NADH and FADH2? why or why no?

Answer 5

no; not ETC or oxidative phosphorylation

Question 6

describe the 3 steps of the electron transport chain

Answer 6

1. electrons are removed from NADH + H+ and FADH2
2. electrons are transported through the ETC and used to make H2O
3. H+ ions are pumped from the matrix into the intermembrane space, creating a proton gradient in the inter membrane space

Question 7

describe the 2 steps of oxidative phosphorylation

Answer 7

1. H+ ions from the inter membrane space bind to ATP synthase on inner membrane
2. ATP synthase synthesizes ATP

Question 8

how many H+ are needed per ATP?

Answer 8

4

Question 9

describe how and how much ATP are yielded from one molecule of NADH

Answer 9

electron transport results in release of ten H+ into intermembrane space (10/4= 2.5), so synthesis of 2.5 ATP

Question 10

describe how and how much ATP are yielded from one molecule of FADH2

Answer 10

this molecule enters further down the ETC, so only releases six H+ into the intermembrane space (6/4= 1.5) so synthesis of 1.5 ATP