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Chapter 18 & 19 Quiz

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Questions and Answers

Which molecule is pyruvate converted into before entering the citric acid cycle?

FADH2

Acetyl CoA (correct)

Oxaloacetate

NADH

Why is pyruvate processed aerobically?

Because oxygen is readily available (correct)

Because it yields high-energy electrons

Because it generates very little ATP

Because it initiates another round of the cycle

What inhibits the activity of the pyruvate dehydrogenase complex?

Low concentrations of ATP and NADH

Low concentrations of NADH and acetyl CoA

High concentrations of NADH and acetyl CoA (correct)

High concentrations of ATP and NADH

What is the initial product of the condensation reaction in the citric acid cycle?

Citrate Signup and view all the answers

How many times does citrate release CO2 in the citric acid cycle?

Twice Signup and view all the answers

What is the final product of the citric acid cycle?

Oxaloacetate Signup and view all the answers

How many GTP molecules are produced in the citric acid cycle per glucose molecule?

2 Signup and view all the answers

How many NADH molecules are produced in the citric acid cycle per glucose molecule?

6 Signup and view all the answers

How many FADH2 molecules are produced in the citric acid cycle per glucose molecule?

2 Signup and view all the answers

Study Notes

Pyruvate Conversion and Citric Acid Cycle

Pyruvate is converted into Acetyl-CoA before entering the citric acid cycle.
Pyruvate is processed aerobically to generate more ATP.
The pyruvate dehydrogenase complex is inhibited by ATP, NADH, and Acetyl-CoA.

Citric Acid Cycle

The initial product of the condensation reaction in the citric acid cycle is Citrate.
Citrate releases CO2 two times in the citric acid cycle.
The final product of the citric acid cycle is Oxaloacetate.
The citric acid cycle produces 2 GTP molecules per glucose molecule.
The citric acid cycle produces 6 NADH molecules per glucose molecule.
The citric acid cycle produces 2 FADH2 molecules per glucose molecule.

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Description

Test your knowledge of the citric acid cycle with this quiz! Explore the key concepts such as pyruvate processing, regulation by acetyl CoA and NADH, and the energy needs of the cell.