4- Stage Three- Krebs cycle

Question 1

outline the steps of the Krebs cycle

Answer 1

1. acetate is removed from Coenzyme A and combined with oxaloacetic acid, forming citrate
2. citrate is decarboxylated and dehydrogenated making a 5C compound, these 2H+ ions are used to produce NADH
3. the 5C compound is decarboxylated and dehydrogenated again, forming a 4C compound producing 1x C02 and 1x NADH
4. phosphate is removed from the 4C molecule to produce an ATP- substrate-level phosphorylation
5. the 4C molecule is dehydrogenated again, releasing 2x H+ ions reducing FAD
6. one more dehydrogenation occurs, producing oxaloacetate

Question 2

what’s oxaloacetic acid

Answer 2

a 4C molecule

Question 3

what’s citrate?

Answer 3

a 6C molecule

Question 4

what is produced after two Krebs cycle turns?

Answer 4

• 4x waste CO2
• 6x NADH
• 2x FADH