which of the following cell organelles is likely to be present in Euglena but not in saccharomyces ( yeast ) ?

Options

A. Nucleus
B. Contractile vacuole
C. Golgi body
D. Mitochondria

Answer

To determine which cell organelle is likely to be present in Euglena but not in Saccharomyces (yeast), we will analyze the functions and presence of each organelle listed in the options.

### Step 1: Identify the Organelles
The organelles mentioned in the question are:
1. Nucleus
2. Contractile vacuole
3. Golgi body
4. Mitochondria

### Step 2: Analyze Each Organelle
- **Nucleus**: The nucleus is present in all eukaryotic cells, including both Euglena and Saccharomyces. Therefore, it cannot be the correct answer.

- **Mitochondria**: Mitochondria are also found in all eukaryotic cells as they are essential for ATP production. Thus, this organelle is present in both Euglena and Saccharomyces.

- **Golgi Body**: The Golgi apparatus is involved in modifying, sorting, and packaging proteins and lipids. It is also present in both Euglena and Saccharomyces.

- **Contractile Vacuole**: This organelle is specifically involved in osmoregulation, helping to maintain water balance in cells. Euglena is an aquatic organism and requires a contractile vacuole to expel excess water. In contrast, Saccharomyces (yeast) is not aquatic and does not require a contractile vacuole for osmoregulation.

### Step 3: Conclusion
Based on the analysis, the organelle that is likely to be present in Euglena but not in Saccharomyces is the **contractile vacuole**.

### Final Answer
The correct answer is **contractile vacuole**.

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