U5T5 – Respiration: Krebs Cycle

Respiration: Krebs Cycle

1 / 20

How many pyruvate molecules are made from one glucose molecule in glycolysis?

1

2

4

2 / 20

How many carbon atoms are carried into the Krebs cycle in each Acetyl Co A?

2

4

6

3 / 20

Where does the Krebs Cycle occur?

Cytoplasm

Matrix

Stroma

4 / 20

How many times does the Krebs cycle happen per glucose molecule?

1

2

6

5 / 20

Molecule B enters the Krebs cycle from the link reaction, what is it ?

Triose Phosphate

Pyruvate

Acetyl Co A

6 / 20

What happens to molecule C?

It leaves the mitochondria to be recycled.

It is recycled back to the link reaction.

It carries H ions to the ETC.

7 / 20

How many carbon atoms are in a single molecule of molecule B?

2

3

6

8 / 20

How many carbon atoms are in a molecule of Citrate?

4

5

6

9 / 20

Which two processes turn Citrate into the 5C intermediate?

Decarboxylation and Hydrogenation

Decarboxylation and Phosphorylation

Decarboxylation and Dehydrogenation

10 / 20

Which molecule is represented by Y?

NADP

Reduced NAD

NAD+

11 / 20

How many molecules of Y will be produced by the krebs cycle from a single molecule of glucose?

3

6

12

12 / 20

A single molecule of W is produced per turn of the Krebs cycle, and it carries hydrogen off to the ETC. What is it?

Reduced FAD

Reduced NAD

Reduced WAD

13 / 20

Molecule Z represents ATP. How is this molecule of ATP generated?

Enzyme level phosphorylation

Oxidative phosphorylation

Substrate level phosphorylation

14 / 20

How many carbon atoms are in a single molecule of Oxaloacetate?

4

5

6

15 / 20

If 3 million molecules of glucose are respired aerobically, how many molecules of CO₂ will be produced by the Krebs Cycle?

3 million

6 million

12 million

16 / 20

If 5 glucose molecules are respired, how many molecules of CO₂ will be produced from Glycolysis, Link reaction and the Krebs cycle?

20

30

25

17 / 20

Isocitrate dehydrogenase is an enzyme used in the Krebs cycle to convert Citrate into the 5C intermediate. IDH1 is an inhibitor of Isocitrate dehydrogenase. What would happen to the volume of Carbon dioxide produced by cells exposed to IDH1?

Increase

Decrease

Stay the same

18 / 20

Isocitrate dehydrogenase is an enzyme used in the Krebs cycle to convert Citrate into the 5C intermediate. IDH1 is an inhibitor of Isocitrate dehydrogenase. What would happen to the concentration of Oxaloacetate produced by cells exposed to IDH1 ?

Increase

Decrease

Stay the same

19 / 20

Isocitrate dehydrogenase is an enzyme used in the Krebs cycle to convert Citrate into the 5C intermediate. IDH1 is an inhibitor of Isocitrate dehydrogenase. What would happen to the concentration of Acetyl Co A produced by cells exposed to IDH1?

Increase

Decrease

Stay the same

20 / 20

Isocitrate dehydrogenase is an enzyme used in the Krebs cycle to convert Citrate into the 5C intermediate. IDH1 is an inhibitor of Isocitrate dehydrogenase. If IDH1 acted as a competitive inhibitor of the enzyme, how would it reduce enzyme activity?

By binding to an allosteric site, altering the tertiary structure of the active site, making it non-complementary to substrates.

By binding to the active site, changing the tertiary structure and therefore making it non-complementary to the substrate.

By blocking the active site, thereby reducing the formation of enzyme-substrate complexes.

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