oxidative phosphorylation

Question 1

what does electron flow down the electron-transport chain lead to?

Answer 1

the transport of protons across the inner mitochondrial membrane from inside the matrix to the intermembrane space.

Question 2

What term is used to describe an ATP-generating process in which an inorganic substance such as oxygen serves as the ultimate electron acceptor?

Answer 2

respiration

Question 3

What organelle is the site of oxidative phosphorylation in eukaryotes?

Answer 3

mitochondria

Question 4

What is a cytochrome?

Answer 4

a protein that transfers electrons and that also contains a heme prosthetic group

Question 5

What type of gradient is critical to ATP formation by oxidative phosphorylation?

Answer 5

proton

Question 6

What type of protein makes the outer mitochondrial membrane relatively permeable?

Answer 6

porin

Question 7

Which electron carrier has a lipid tail?

Answer 7

coenzyme Q

Question 8

Which enzyme catalyzes the reduction of oxygen to water?

Answer 8

cytochrome c oxidase

Question 9

Which enzyme transfers electrons from a membrane-soluble carrier to a water-soluble carrier in the electron-transport process?

Answer 9

Q-cytochrome c oxidoreductase

Question 10

Which of the citric acid cycle enzymes is also part of an electron-transport complex?

Answer 10

succinate dehydrogenase

Question 11

What is the net yield of ATP molecules produced during cellular respiration, per molecule of glucose completely oxidized to carbon dioxide and water?

Answer 11

30

Question 12

Which carrier in the electron-transport chain is a protein (as opposed to a small molecule)?

Answer 12

Cytochrome c

Question 13

what is a component of the etc?

Answer 13

FADH2
iron sulphur proteins
cytochrome c1
NADH

Question 14

What does NOT participate in, nor is a component of, the electron-transport chain?

Answer 14

ATP

Question 15

What does not pump protons?

Answer 15

Complex II

Question 16

Which electron carrier is not able to transfer one electron at a time?

Answer 16

NADH

Question 17

what is the pmf generated by?

Answer 17

the etc in mitochondria

Question 18

what does the pmf do?

Answer 18

drives ATP synthesis in the mitochondria

Question 19

what are the components of the pmf?

Answer 19

charge gradient of protons
chemical gradient of protons

Question 20

What is not true of the proton motive force (pmf)?

Answer 20

Generation of the pmf in mitochondria requires succinate.

Question 21

What is the ultimate electron acceptor in aerobic organisms?

Answer 21

oxygen

Question 22

what are the features of the chemiosmotic theory?

Answer 22

• Electron transfer in mitochondria is accompanied by an asymmetric release of protons on one side of the inner mitochondrial membrane.
• Energy is conserved as a transmembrane pH gradient.
• Oxidative phosphorylation cannot occur in membrane-free preparations.

Question 23

what is not a feature of the chemiosmotic theory?

Answer 23

The membrane ATPase, which plays an important role in other hypotheses for energy coupling, has no significant role in the chemiosmotic theory

Question 24

The energy for ATP synthesis is generated by the movement of protons from the __________ side of the inner mitochondrial membrane establishing a(an) __________ gradient.

Answer 24

matrix; pH