One turn of Krebs' cycle for the oxidation of 1 mol of sucrose produce how many ATP molecules ?

Options

A. 12
B. 24
C. 22
D. 11

Explanation

To determine how many ATP molecules are produced in one turn of the Krebs cycle for the oxidation of one mole of sucrose, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Krebs Cycle**: The Krebs cycle, also known as the citric acid cycle or TCA cycle, is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins.

2. **Identify the Source of Acetyl-CoA**: Sucrose is a disaccharide composed of glucose and fructose. When sucrose is metabolized, it is broken down into glucose and fructose, both of which can enter the Krebs cycle.

3. **Determine the Turns of the Krebs Cycle**: One mole of glucose produces 2 moles of acetyl-CoA, leading to 2 turns of the Krebs cycle. Since sucrose is made up of one mole of glucose and one mole of fructose, it effectively leads to the production of 4 moles of acetyl-CoA (2 from glucose and 2 from fructose).

4. **Calculate ATP Production**:
- Each turn of the Krebs cycle produces 12 ATP molecules.
- Since sucrose leads to 4 turns of the Krebs cycle (2 from glucose and 2 from fructose), the total ATP produced from the complete oxidation of sucrose would be:
\[ 4 \text{ turns} \times 12 \text{ ATP/turn} = 48 \text{ ATP} \]

5. **Focus on One Turn of the Krebs Cycle**: The question specifically asks for the ATP produced in just one turn of the Krebs cycle. Therefore, the answer is simply:
\[ 12 \text{ ATP} \]

### Final Answer:
In one turn of the Krebs cycle for the oxidation of one mole of sucrose, **12 ATP molecules** are produced.

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