In the dc ad cyde, acetyl Co-A joins the cycle by B citrate pyruvate acetate oxaloacetate alpha ketoglutarate

Human Anatomy & Physiology (11th Edition)
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### Citric Acid Cycle Quiz

**Question:**
In the citric acid cycle, acetyl Co-A joins the cycle by combining with:

**Answer Choices:**
- A. citrate
- B. pyruvate
- C. acetate
- D. oxaloacetate
- E. alpha-ketoglutarate

**Explanation:**
The question is about the initiation of the citric acid cycle (Krebs cycle), which is a crucial metabolic pathway involved in energy production. Acetyl Co-A, a derivative of pyruvate, enters the citric acid cycle by combining with one of the intermediates listed in the choices.

**Correct Answer:**
To solve the question, we need to identify which compound acetyl Co-A combines with at the start of the cycle. The correct answer is "D. oxaloacetate."

This combination produces citrate, which is the first step in the citric acid cycle.
Transcribed Image Text:### Citric Acid Cycle Quiz **Question:** In the citric acid cycle, acetyl Co-A joins the cycle by combining with: **Answer Choices:** - A. citrate - B. pyruvate - C. acetate - D. oxaloacetate - E. alpha-ketoglutarate **Explanation:** The question is about the initiation of the citric acid cycle (Krebs cycle), which is a crucial metabolic pathway involved in energy production. Acetyl Co-A, a derivative of pyruvate, enters the citric acid cycle by combining with one of the intermediates listed in the choices. **Correct Answer:** To solve the question, we need to identify which compound acetyl Co-A combines with at the start of the cycle. The correct answer is "D. oxaloacetate." This combination produces citrate, which is the first step in the citric acid cycle.
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