The Krebs Cycle Quiz

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Explain what happens to the acetyl CoA molecules in the Krebs cycle?

The acetyl CoA molecules undergo further breakdown and oxidation in the Krebs cycle, resulting in the production of energy-rich molecules such as NADH and FADH2, as well as carbon dioxide.

What is the initial reaction of acetyl CoA in the Krebs cycle?

The initial reaction of acetyl CoA in the Krebs cycle is its combination with a four-carbon molecule called oxaloacetate to form a six-carbon molecule called citric acid.

What is another name for the Krebs cycle and why is it called that?

Another name for the Krebs cycle is the citric acid cycle, named after the formation of citric acid in the initial reaction of acetyl CoA with oxaloacetate.

What are the products of the oxidation reaction of citric acid in the Krebs cycle?

The products of the oxidation reaction of citric acid in the Krebs cycle are NADH and carbon dioxide. Signup and view all the answers

What is the role of the four-carbon molecule in the Krebs cycle?

The four-carbon molecule undergoes further oxidation, producing NADH, FADH2, and ATP, before being transformed back into oxaloacetate to complete the cycle. Signup and view all the answers

What is the purpose of the energy released by the oxidation reaction in the Krebs cycle?

The energy released by the oxidation reaction is used to join ADP and phosphate to form ATP, which serves as a source of energy for the cell. Signup and view all the answers

What are the electron carriers produced in the Krebs cycle and what is their role?

The electron carriers produced in the Krebs cycle are NADH and FADH2, which carry electrons to the electron transport chain for further energy production. Signup and view all the answers

Explain why the Krebs cycle is considered a cycle?

The Krebs cycle is considered a cycle because it begins and ends with the same molecule, oxaloacetate, forming a continuous circular pathway. Signup and view all the answers

What are some of the useful molecules produced in the Krebs cycle?

Useful molecules produced in the Krebs cycle include NADH, FADH2, ATP, and carbon dioxide, which are essential for energy production and cellular respiration. Signup and view all the answers

What happens to the acetyl-CoA molecules after completing the Krebs cycle?

After completing the Krebs cycle, the acetyl-CoA molecules are completely oxidized and broken down to carbon dioxide, which will be exhaled, and the energy-rich molecules produced will carry electrons to the electron transport chain for further energy production. Signup and view all the answers

Acetyl CoA's fate in Krebs

Acetyl CoA is broken down and oxidized in the Krebs cycle, producing energy-rich molecules like NADH and FADH2.

Krebs cycle initial rxn

Acetyl CoA combines with oxaloacetate to form citric acid.