Respiration- the Krebs' Cycle

Question 1

Where does the Krebs’ Cycle occur in the cell?

Answer 1

In the matrix of the mitochondrion

Question 2

They do not directly consume this, but it must be available for the reactions to proceed, what is this?

Answer 2

Oxygen

Question 3

During the Krebs’ Cycle reactions, 2 acetyl Co enzyme A molecules deliver acetly groups to oxaloacetate molecules (4C) to form what?

Answer 3

Citrate (6C)

Question 4

What happens to the Co enzyme A during the first step of the Krebs’ Cycle?

Answer 4

In the first step, CoA splits off from acetyl CoA and becomes available to be reused in the link reactions.

Question 5

After, citrate (6C) compound undergoes dehydrogenation and decarboxylation to form?

Answer 5

A 5C compound called alpha- ketoglutarate

Question 6

Alpha- ketoglutarate then undergoes dehydrogenation and decarboxylation to form?

Answer 6

4C compound called succinate

Question 7

Succinate then undergoes dehydrogenation to form?

Answer 7

Fumarate, a 4C compound

Question 8

Fumarate undergoes a chemical reaction to form?

Answer 8

4C compound called malate

Question 9

Malate then undergoes dehydrogenation to form?

Answer 9

oxaloacetate (4C)

Question 10

How many CO2 molecules are formed for each acetyl CoA molecule that enters the Krebs’ Cycle?

Answer 10

2

Question 11

How many NAD molecules are reduced to NADH+ and H+?

Answer 11

3

Question 12

How many FAD molecules are reduced to FADH+ H+?

Answer 12

1

Question 13

How many ATP molecules are manufactured for each acetyl CoA?

Answer 13

1

Question 14

How is the ATP manufactured?

Answer 14

By substrate level phosphorylation.