DAT Biology: Cellular Metabolism 4

Question 1

What is the final electron acceptor of the electron transport chain in aerobic respiration?

Accepted Answer

Oxygen

Answer

Water

Answer

NAD+

Answer

Carbon dioxide

Question 2

The proton gradient driving ATP synthase is established across which membrane?

Accepted Answer

Inner mitochondrial membrane

Answer

Outer mitochondrial membrane

Answer

Plasma membrane

Answer

Nuclear envelope

Question 3

Approximately how many ATP are produced per NADH via oxidative phosphorylation (modern estimate)?

Accepted Answer

2.5

Answer

3.5

Answer

1.5

Answer

4.5

Question 4

Which mechanism does ATP synthase use to generate ATP?

Accepted Answer

Chemiosmosis

Answer

Substrate-level phosphorylation

Answer

Beta-oxidation

Answer

Glycolysis

Question 5

Cyanide blocks cellular respiration primarily by inhibiting which complex?

Accepted Answer

Complex IV (cytochrome c oxidase)

Answer

Complex I

Answer

ATP synthase

Answer

Complex II

Question 6

What does an uncoupling agent like 2,4-dinitrophenol do to the inner membrane?

Accepted Answer

Makes it permeable to protons, dissipating the gradient

Answer

Blocks electron flow entirely

Answer

Increases ATP synthesis

Answer

Stops oxygen consumption

Question 7

What is the approximate total ATP yield from the complete aerobic oxidation of one glucose molecule?

Accepted Answer

30-32

Answer

2

Answer

4

Answer

15-16