Mitochondria perform all of the following functions except

Options

A. Nucleic acid synthesis
B. Steroid synthesis
C. ATP synthesis
D. Polysaccharide degradation

Answer

### Step-by-Step Solution:

1. **Understanding Mitochondria Functions**: Mitochondria are known as the powerhouse of the cell because they are primarily involved in energy production. They synthesize ATP (adenosine triphosphate), which is the energy currency of the cell.

2. **ATP Synthesis**: One of the main functions of mitochondria is ATP synthesis. This process occurs through cellular respiration, where glucose and oxygen are utilized to produce ATP, carbon dioxide, and water.

3. **Mitochondrial DNA**: Mitochondria also have their own DNA, known as mitochondrial DNA (mtDNA). This allows them to replicate independently of the cell’s nuclear DNA and synthesize some of their own proteins.

4. **Steroid Synthesis**: Mitochondria are involved in the synthesis of certain steroids. They play a role in the biosynthesis of steroid hormones, which are crucial for various physiological functions.

5. **Identifying the Exception**: The question asks for a function that mitochondria do not perform. While they are involved in ATP synthesis, DNA synthesis, and steroid synthesis, they do not metabolize or break down polysaccharides. This function is typically carried out in the cytoplasm or other organelles, not in mitochondria.

6. **Final Answer**: Therefore, the correct answer to the question is that mitochondria do not metabolize or break down polysaccharides.