Which organelles are called ribonucleoprotein particles?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Term**: The question asks about organelles referred to as "ribonucleoprotein particles." This term indicates that these organelles are composed of both RNA (ribonucleic acid) and proteins.

2. **Identifying the Organelle**: The organelles that fit this description are ribosomes. Ribosomes are essential cellular structures involved in protein synthesis.

3. **Composition of Ribosomes**: Ribosomes are made up of two main components: ribosomal RNA (rRNA) and proteins. This combination of RNA and proteins is what earns them the designation of "ribonucleoprotein particles."

...