Which one of the following mammalian cells is not capable of metabolising glucose to carbon-dioxide aerobically ?

Options

A. Red blood cells
B. White blood cells
C. Unstriated muscle cells
D. Liver cells

Answer

To solve the question of which mammalian cell is not capable of metabolizing glucose to carbon dioxide aerobically, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Aerobic Metabolism**: Aerobic metabolism refers to the process of producing cellular energy in the presence of oxygen. This process primarily occurs in the mitochondria of cells, where glucose is broken down to produce carbon dioxide, water, and ATP (energy).

2. **Identify the Cell Types**: The question provides several options:
- Red Blood Cells (RBCs)
- White Blood Cells (WBCs)
- Unstratified Muscle Cells
- Liver Cells

3. **Analyze Red Blood Cells (RBCs)**: Mammalian RBCs are unique because they lack mitochondria, which are essential for aerobic respiration. Without mitochondria, RBCs cannot carry out the aerobic metabolism of glucose to carbon dioxide.

4. **Evaluate Other Cell Types**:
- **White Blood Cells (WBCs)**: These cells have mitochondria and can metabolize glucose aerobically.
- **Unstratified Muscle Cells**: These muscle cells also contain mitochondria and can perform aerobic respiration.
- **Liver Cells**: Liver cells are known for their metabolic functions and possess mitochondria, allowing them to metabolize glucose aerobically.

5. **Conclusion**: Since only the Red Blood Cells lack the necessary organelles for aerobic metabolism, they are the only cells listed that cannot metabolize glucose to carbon dioxide aerobically.

### Final Answer:
The mammalian cell that is not capable of metabolizing glucose to carbon dioxide aerobically is the **Red Blood Cell (RBC)**.

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