Kreb Cycle

Question 1

What are the 3 phases of the Krebs cycle?

Answer 1

Acetyl CoA entry, citrate oxidation, and oxaloacetate regeneration

Question 2

What is the Krebs cycle also known as?

Answer 2

The citric acid cycle

Question 3

How many Acetyl CoA does pyruvate oxidation make?

Answer 3

2

Question 4

What is the structure of Acetyl CoA?

Answer 4

2 carbon atoms joined to CoA

Question 5

What part of Acetyl CoA doesn’t go into Krebs cycle? What happens instead?

Answer 5

CoA, goes to be part of another pyruvate oxidation

Question 6

What is the krebs cycle?

Answer 6

The 3rd stage of cellular respiration, AKA citric acid cycle

Question 7

What is the end goal of the Krebs cycle?

Answer 7

To oxidize Acetyl CoA to make chemical energy (ATP, NADH, and FADH)

Question 8

What happens to the 2 carbons that enter Kreb cycle? What does this create? What stage is this of the cycle?

Answer 8

React with 4 carbons of oxaloacetate, creates 6 carbon citrate, stage 1

Question 9

What happens in citrate oxidation?

Answer 9

Citrate gets rearranged and oxidized (loses electrons)

Question 10

What are the products of citrate oxidation?

Answer 10

1 ATP, 2 NADH, 2 CO2

Question 11

What happens during oxaloacetate regeneration? What stage of the citric acid cycle is this?

Answer 11

Oxaloacetate gets regenerated by continuing to be oxidated, producing 1 NADH and 1 FADH2. Stage 3

Question 12

How many glucose molecules per round of the Kreb cycle? How many per acetyl CoA?

Answer 12

2 rounds per 1 molecule, 1 per acetyl CoA

Question 13

What is the total output of the Kreb cycle?

Answer 13

2 FADH2, 2 ATP, 6 NADH, (1st 3 to ETC) 4 CO2 (exhaled)

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Fadh2, Atp, Nadh, Co2!