Krebs Cycle

Question 1

What is the krebs cycle?

Answer 1

Series of enzyme regulated chemical steps that occur in aerobic organisms

Question 2

How does krebs cycle release energy?

Answer 2

Oxidising acetyl-CoA

Question 3

What is the first step of the krebs cycle?

Answer 3

Pyruvate (from glycolysis) converted to acetyl-CoA
Decarboxylated + CoA added
Using CoA-SH + NAD+
Produces NADH + CO2

Question 4

What is the second step?

Answer 4

Acetyl CoA enters krebs cycle

Converted to citric acid

Question 5

What is third step?

Answer 5

Citric acid interconversion to isomer isocitric acid

Using aconitase

Question 6

What is the fourth step?

Answer 6

Isocitrate —-> alpha-ketoglutarate

Using isocitrate dehydrogenase

Question 7

What is the fifth step?

Answer 7

Alpha-ketoglutarate —-> succinyl-CoA
Using alpha-ketoglutarate dehydrogenase complex
Succinyl-CoA —-> succinate
Using succinyl-CoA synthase

Question 8

What is the sixth step?

Answer 8

Succinate —-> fumarate

Using succinate dehydrogenase

Question 9

What is the seventh step?

Answer 9

Fumarate —-> malate

Using fumarase

Question 10

What is the eighth step?

Answer 10

Malate —-> oxaloacetate

Using malate dehydrogenase

Question 11

What does krebs deliver?

Answer 11

3 NAD+
1 FAD
1 ATP

Question 12

How many ATP in krebs?

Answer 12

12