Krebs cycle

Question 1

How is called the molecule which is formed by the combination of acetyl-CoA and oxaloacetate? How many carbons does it have? How is called the reaction through which it is produced?

Answer 1

Citrate, 6 carbons, condensation

Question 2

How many carbons does the acetyl group of acetyl-CoA have?

Answer 2

2

Question 3

How many carbons does the oxaloacetate molecule have?

Answer 3

4

Question 4

Krebs cycle’s first reaction, condensation, is inhibited by a large concentration of …

Answer 4

ATP

Question 5

How do we call reactions 2 and 3, during which the hydroxyl group of citrate changes place ?

Answer 5

Isomerization, the product is isocitrate

Question 6

What are reactions 4 and 5? What do they produce? What is added to the molecule during reaction 5?

Answer 6

They are oxidations, they reduce a molecule of NAD+ to NADH each and each produces a CO2. Coenzyme A

Question 7

How is called reaction 6? What happens?

Answer 7

Substrate-Level Phosphorylation. CoA leaves, releasing enough energy for guanosine diphosphate (GDP) to take a phosphate and become guanosine triphosphate (GTP) GTP then transfers the phosphate to ADP, converting it to ATP.

Question 8

What is reaction 7?

Answer 8

An oxydation in which FAD is the electron acceptor, yielding FADH2.

Question 9

What are the two last reactions, 8 and 9?

Answer 9

The regeneration of oxaloacetate. Another NADH is produced.