Kreb Cycle

Question 0

Step 2

Citrate is

Answer 0

Isomerized by

Transfer of OH group to yield

Isocitrate

Question 1

Step 1

Acetyl group is transferred from

Answer 1

Acetyl-SCoA

To

Oxaloacetate

Produced in step 8

Question 2

Step 3

Isocitrate loses

Answer 2

CO2
And is

Oxidized to yield
Alpha- ketoglutarate

Question 3

Step 4

Alpha-ketoglutarate
Reacts with

Answer 3

Coenzyme A
And loses
CO2 to yield
Succinyl-SCoA

Question 4

Step 5

Succinyl-CoA is set

Answer 4

Free to give
Succinate
Plus
CoA 
In a reaction coupled with
ATP formation

Question 5

Step 6

Two hydrogens

Answer 5

Are removed from
Succinate
To yield
Fumarate

Question 6

Step 7

Addition of water

Answer 6

To the double bond of
Fumarate yields
Malate

Question 7

Step 8

The cycle of reactions

Answer 7

Is completed by

Oxidation of malate to
Regenerate
Oxaloacetate

Question 8

Acetyl CoA available from the

Answer 8

Breakdown of
Carbohydrates
Lipids
Amino acids

Question 9

Acetyl CoA is the

Answer 9

Fuel of the citric acid cycle

Question 10

The operation of the cycle requires a supply of the

Answer 10

Oxidizing agents

NAD and FAD

Question 11

The cycle is dependent on

Answer 11

Reactions of the electron transport chain

Question 12

the electron transport chain supplys

Answer 12

The necessary
NAD
FAD

Question 13

In each turn of the cycle

Answer 13

Acetyl CoA enters and two fully oxidized carbon molecules leave as CO2

Question 14

Acetyl-CoA

From the

Answer 14

Glycolytic pathway
or
From fatty acid catabolism

Question 15

Three molecules of

Answer 15

NAD

Question 16

One molecule of

Answer 16

FAD

Question 17

Three molecules of NAD and one molecule of FAD are

Answer 17

Reduced

Question 18

One molecule of GTP

Answer 18

Is generated in a

Substrate level phosphorylation reaction

Question 19

GTP

Answer 19

Interconvertible with ATP