Mitochondria are non-existent in

Options

A. red algae
B. bacteria
C. green algae
D. all of these

Answer

**Step-by-Step Solution:**

1. **Understanding Mitochondria**: Mitochondria are known as the powerhouse of the cell and are membrane-bound organelles found in eukaryotic cells. They play a crucial role in energy production through cellular respiration.

2. **Distinguishing Between Eukaryotic and Prokaryotic Cells**: Eukaryotic cells are characterized by the presence of membrane-bound organelles, including mitochondria. In contrast, prokaryotic cells, such as bacteria, do not have membrane-bound organelles.

3. **Identifying Cell Types**: The question asks where mitochondria are non-existent. We need to identify the types of cells that do not contain mitochondria. Eukaryotic cells, such as those found in red and green algae, do contain mitochondria because they are multicellular eukaryotes.

4. **Conclusion**: Since prokaryotic cells (like bacteria) do not have mitochondria, the answer to the question is that mitochondria are non-existent in prokaryotic cells.

**Final Answer**: Mitochondria are non-existent in prokaryotic cells (e.g., bacteria).

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