An organism having cytoplasm DNA and RNA but no cell wall is

Options

A. Virus
B. Bacterium
C. Mycoplasma
D. Cyanobacterium.

Answer

To solve the question "An organism having cytoplasm, DNA, RNA but no cell wall is," we will analyze the options provided and identify the correct answer.

### Step-by-Step Solution:

1. **Understanding the Characteristics**: We need to identify an organism that has the following characteristics:
- Presence of cytoplasm
- Presence of DNA
- Presence of RNA
- Absence of a cell wall

2. **Analyzing the Options**:
- **Option 1: Virus**: Viruses contain genetic material (DNA or RNA) but do not have a cellular structure, including cytoplasm. They also do not have a cell wall. Thus, this option does not fit the criteria.
- **Option 2: Bacterium**: Bacteria typically have a cell wall, which disqualifies this option since we are looking for an organism without a cell wall.
- **Option 3: Mycoplasma**: Mycoplasma are a genus of bacteria known for lacking a cell wall. They do have cytoplasm, DNA, and RNA, making this option a strong candidate.
- **Option 4: Cyanobacterium**: Cyanobacteria are photosynthetic bacteria that have a cell wall, so this option is also disqualified.

3. **Conclusion**: After analyzing all the options, the only organism that meets all the criteria (cytoplasm, DNA, RNA, and no cell wall) is **Mycoplasma**. Therefore, the correct answer is **Option 3: Mycoplasma**.

### Final Answer:
The organism having cytoplasm, DNA, RNA but no cell wall is **Mycoplasma**.

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