Which structures are found in mycoplasmas spirochaetes and rickettsias

Options

A. DNA
B. RNA
C. Ribosomes
D. All the above.

Answer

To answer the question "Which structures are found in mycoplasmas, spirochaetes, and rickettsias?", we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understand Prokaryotic Organisms**:
- Mycoplasmas, spirochaetes, and rickettsias are all classified as prokaryotes. Prokaryotes are unicellular organisms that lack membrane-bound organelles and a defined nucleus.

2. **Identify Genetic Material**:
- Prokaryotes contain genetic material in the form of DNA. They do not have a nuclear envelope, meaning their DNA is not enclosed within a membrane.

3. **Presence of RNA**:
- In addition to DNA, prokaryotes also contain RNA, which plays a crucial role in protein synthesis and other cellular functions.

4. **Ribosomes in Prokaryotes**:
- Prokaryotic cells contain ribosomes, which are essential for protein synthesis. These ribosomes are found in the cytoplasm.

5. **Conclusion**:
- Since mycoplasmas, spirochaetes, and rickettsias are prokaryotic organisms, they possess all the structures mentioned: DNA, RNA, and ribosomes.

6. **Final Answer**:
- Therefore, the correct answer to the question is "d) all of the above".