Ribosomes is often called

Options

A. Microsome
B. RNA particle
C. Dictyosome
D. Oxysome.

Answer

### Step-by-Step Solution:

1. **Understanding Ribosomes**: Ribosomes are cellular structures that play a crucial role in protein synthesis. They are often referred to as the "protein factories" of the cell.

2. **Composition of Ribosomes**: Ribosomes are made up of ribonucleic acid (RNA) and proteins. They consist of two subunits, which are essential for their function.

3. **Subunits of Ribosomes**: Each ribosomal subunit is composed of one or more ribosomal RNA (rRNA) molecules and ribosomal proteins. This composition is what allows ribosomes to carry out their function in protein synthesis.

4. **Identifying the Correct Term**: Among the options given:
- **Microsome**: This refers to small vesicles derived from the endoplasmic reticulum, not ribosomes.
- **Dictyosome**: This is a term used for Golgi apparatus in plant cells, not related to ribosomes.
- **Auxosome**: This term is not commonly associated with ribosomes.
- **RNA Particle**: This is the correct term for ribosomes, as they are primarily composed of RNA and are involved in protein synthesis.

5. **Conclusion**: Therefore, the correct answer to the question "Ribosomes is often called" is **RNA particle**.