ETS in bacteria is found

Options

A. cell membrane
B. cell wall
C. cytoplasm
D. mitochondrion

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks where the Electron Transport Chain (ETS) is found in bacteria. ETS is a crucial component of cellular respiration, which involves the transfer of electrons through a series of proteins to produce ATP.

2. **Identifying Bacterial Structure**: Bacteria are prokaryotic organisms, meaning they lack membrane-bound organelles such as mitochondria. This is an essential point because, in eukaryotic cells, the ETS occurs in the mitochondria.

3. **Locating ETS in Bacteria**: Since bacteria do not have mitochondria, we need to identify where the ETS occurs in these organisms. The electron transport chain in bacteria is located in the plasma membrane (also referred to as the cell membrane).

4. **Analyzing the Options**: The options provided are:
- A) Cell membrane
- B) Cell wall
- C) Cytoplasm
- D) Mitochondria

Based on our understanding, the cell membrane is the correct answer since it is where the ETS operates in bacteria.

5. **Conclusion**: Therefore, the correct answer to the question "ETS in bacteria is found" is **option A: Cell membrane**.