Which among the following are present in bacterial cells?
(i) Mesosome
(ii) Ribosome
(iii) Plastid
(iv) Plasmid
(v) Mitochondria

Options

A. (i) , (iv) and (v)
B. (ii),(iii) and (iv)
C. (i),(ii) and (iv)
D. (i),(ii),(iii),(iv) and (v)

Answer

To determine which of the following are present in bacterial cells, we will analyze each option provided in the question:

1. **Mesosome**:
- Mesosomes are structures formed by the infolding of the plasma membrane in bacterial cells. They are involved in various cellular processes, including respiration and cell division. Therefore, mesosomes are present in bacterial cells.

2. **Ribosome**:
- Ribosomes are the sites of protein synthesis in all living cells, including bacteria. They are not membrane-bound organelles and are essential for translating mRNA into proteins. Hence, ribosomes are present in bacterial cells.

3. **Plastid**:
- Plastids are membrane-bound organelles found in plant cells and some protists, involved in the synthesis and storage of food. Since bacteria are prokaryotic cells and do not have membrane-bound organelles, plastids are absent in bacterial cells.

4. **Plasmid**:
- Plasmids are small, circular pieces of DNA that are separate from the chromosomal DNA in bacteria. They can carry genes that provide bacteria with genetic advantages, such as antibiotic resistance. Therefore, plasmids are present in bacterial cells.

5. **Mitochondria**:
- Mitochondria are membrane-bound organelles known as the powerhouse of the cell, responsible for producing energy in eukaryotic cells. Since bacteria are prokaryotic and lack membrane-bound organelles, mitochondria are absent in bacterial cells.

**Conclusion**: The structures that are present in bacterial cells are:
- Mesosome
- Ribosome
- Plasmid

Thus, the correct answer is (i) Mesosome, (ii) Ribosome, and (iv) Plasmid.