There are some structures that are common to all prokaryotic cells, and others that are only found in some bacterial species or strains. Select the structures below that are found in all bacterial cells. View Available Hint(s) \( \square \) plasma membrane capsule fimbriae pilus (pili) nucleoid wall ribosomes cytoplasm flagella

To determine which structures are found in all bacterial cells, let's analyze each option: 1. **Plasma membrane**: This is a fundamental structure in all prokaryotic cells, including bacteria. It serves as a barrier that separates the interior of the cell from the external environment. 2. **Capsule**: This is not found in all bacterial cells. It is a protective layer that some bacteria have, but many do not. 3. **Fimbriae**: These are hair-like structures that help bacteria adhere to surfaces. Not all bacteria possess fimbriae. 4. **Pilus (pili)**: These are used for attachment and conjugation (transfer of genetic material). Like fimbriae, not all bacteria have pili. 5. **Nucleoid**: This is the region in a prokaryotic cell where the genetic material (DNA) is located. All bacteria have a nucleoid. 6. **Ribosomes**: These are essential for protein synthesis and are found in all bacterial cells. 7. **Cytoplasm**: This is the gel-like substance within the cell membrane where cellular processes occur. All bacteria have cytoplasm. 8. **Flagella**: These are used for movement and are not present in all bacterial cells. Some bacteria are non-motile and do not have flagella. Based on this analysis, the structures found in all bacterial cells are: - Plasma membrane - Nucleoid - Ribosomes - Cytoplasm Thus, the correct selections are: - \( \square \) plasma membrane - \( \square \) nucleoid - \( \square \) ribosomes - \( \square \) cytoplasm