CELLULAR RESPIRATION L8

Question 1

respiration

Answer 1

• occurs in all cells
• catabolic
• series of redox reactions

Question 2

glycolysis

Answer 2

• “sugar splitting”
• breaks down glucose
• does not require O2
• occurs in cytoplasm
• starts with 1 glucose
• ends with 2 pyruvate

Question 3

E payoff

Answer 3

• makes ATP

- exergonic

Question 4

E investment

Answer 4

• uses ATP

- endergonic

Question 5

pyruvate oxidation

Answer 5

• aerobic only
• takes place in mitochondria
• catalyzed by pyruvate dehydrogenase
• no ATP used or produced

Question 6

citric acid cycle

Answer 6

• takes place in matrix of mitochondria

- generates: 4 CO2, 2 ATP, 6 NADH, 1 FADH2

Question 7

oxidative phosphorylation

Answer 7

• energy stored in NADH and FADH2 used to create a protein gradient
• chemiosmosis drives ATP synthesis via oxidative phosphorylation

Question 8

chemiosmosis

Answer 8

• proton diffusion across inner membrane
• E coupling mechanism used to synthesize ATP
• “proton motive force”

Question 9

electron transport chain

Answer 9

• series of e carriers
• inner mitochondrial membrane
• series of redox reactions
• E from transfers used to establish H+ gradient
• intermembrane space [H+] > matrix [H+]

Question 10

ATP synthase

Answer 10

• protein complex
• inner mitochondrial membrane
• “molecular mill”
• H+ diffuse through, causes rotation, E for ATP synthesis