The Citric Acid Cycle Quiz

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Questions and Answers

What is the primary function of the citric acid cycle?

Synthesizing ATP for energy supply to the body (correct)
Converting glucose to pyruvate for energy production
Producing NADH and FADH2 for cellular respiration
Facilitating the breakdown of lipids for energy release

Where does the citric acid cycle occur predominantly?

Cytosol
Endoplasmic reticulum
Mitochondria (correct)
Nucleus

What is the final electron acceptor in the citric acid cycle?

Carbon dioxide
NADH
Oxygen (correct)
Water

What is the major source of acetyl CoA for the citric acid cycle?

<p>Oxidative decarboxylation of pyruvate (A)</p> Signup and view all the answers

What percentage of ATP is synthesized in the citric acid cycle?

<p>60-75% (B)</p> Signup and view all the answers

Flashcards

What is the primary function of the citric acid cycle?

The citric acid cycle is a central metabolic pathway responsible for generating energy by oxidizing acetyl-CoA, producing electron carriers (NADH and FADH2), and releasing carbon dioxide. This process is essential for ATP synthesis, the primary energy currency of the body.

Where does the citric acid cycle occur?

The citric acid cycle occurs within the mitochondria, specifically in the mitochondrial matrix. This organelle is often referred to as the 'powerhouse' of the cell due to its crucial role in energy metabolism.

What is the final electron acceptor in the citric acid cycle?

Oxygen is the final electron acceptor in the citric acid cycle. Electrons transferred from NADH and FADH2 to the electron transport chain are ultimately passed on to oxygen, forming water. This process is essential for oxidative phosphorylation, the main source of ATP production.

What is the main source of Acetyl-CoA for the citric acid cycle?

The major source of acetyl-CoA for the citric acid cycle is the oxidative decarboxylation of pyruvate, a process that occurs in the mitochondrial matrix. Pyruvate is a product of glycolysis, which breaks down glucose to generate pyruvate and ATP.

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What percentage of ATP is synthesized by the citric acid cycle?

The citric acid cycle directly generates a small amount of ATP, but its main contribution to ATP synthesis is through the production of NADH and FADH2, which transfer electrons to the electron transport chain for oxidative phosphorylation. This process is responsible for the synthesis of 60-75% of the body's total ATP.

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Study Notes

Citric Acid Cycle

The primary function of the citric acid cycle is to generate energy for the cell by producing ATP, NADH, and FADH2 from the breakdown of acetyl-CoA.
The citric acid cycle occurs predominantly in the mitochondria, where it plays a crucial role in cellular respiration.
The final electron acceptor in the citric acid cycle is oxygen, which is used to generate ATP during oxidative phosphorylation.
The major source of acetyl-CoA for the citric acid cycle is the breakdown of carbohydrates, fats, and proteins, which are converted into acetyl-CoA through glycolysis, beta-oxidation, and other catabolic pathways.
Approximately 2-3 ATP are synthesized in the citric acid cycle, which accounts for a significant percentage of the total ATP produced during cellular respiration.

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Description

Test your knowledge of the Citric Acid Cycle, also known as the Krebs Cycle or Tricarboxylic Acid Cycle, which is a crucial metabolic pathway for energy production in the body. This quiz will challenge your understanding of the cycle's role in ATP synthesis, the oxidation of Acetyl CoA, and its utilization of oxygen.