Which one is included under prokaryotes?

Options

A. Amoeba
B. Algae
C. Ulothrix
D. Mycoplasma and Blue- Green Algae.

Answer

### Step-by-Step Solution:

1. **Understand the Definition of Prokaryotes**:
Prokaryotes are organisms that lack a true nucleus and membrane-bound organelles. Their genetic material is not enclosed within a nuclear membrane; instead, it is found in a region called the nucleoid within the cytoplasm.

2. **Analyze the Options**:
The options provided are:
- A) Amoeba
- B) Alga
- C) Eulothrix
- D) Mycoplasma
- E) Blue Green Alga

3. **Evaluate Each Option**:
- **Amoeba**: This is a unicellular organism classified as a protist and is a eukaryote because it has a true nucleus and membrane-bound organelles. Therefore, it is not a prokaryote.
- **Alga**: Algae are primarily eukaryotic organisms that also possess a true nucleus and membrane-bound organelles. Thus, they are not prokaryotes.
- **Eulothrix**: This is a type of green alga, which is also a eukaryote due to the presence of a true nucleus and membrane-bound organelles. Hence, it is not a prokaryote.
- **Mycoplasma**: Mycoplasma are the smallest known prokaryotes. They lack a true nucleus and do not have cell walls, which makes them a part of the prokaryotic kingdom.
- **Blue Green Alga**: Also known as cyanobacteria, these organisms are prokaryotes. They perform photosynthesis but do not have a true nucleus or membrane-bound organelles.

4. **Identify the Correct Answer**:
Based on the evaluation, both Mycoplasma and Blue Green Alga are included under prokaryotes. However, since the question asks for one option, the best choice is **D) Mycoplasma**, as it is a well-known representative of prokaryotes.

### Final Answer:
**D) Mycoplasma**