Besides proteins, ribosomes contain

Options

A. DNA
B. RNA
C. Both DNA and RNA
D. Lipids

Answer

### Step-by-Step Text Solution

1. **Understanding Ribosomes**: Ribosomes are cellular structures responsible for synthesizing proteins. They are often referred to as the "protein factories" of the cell.

2. **Composition of Ribosomes**: Besides proteins, ribosomes primarily contain ribonucleic acid (RNA). This RNA is crucial for the ribosome's function in protein synthesis.

3. **Types of RNA in Ribosomes**: In eukaryotic cells, ribosomes contain several types of RNA, including:
- 28S rRNA
- 18S rRNA
- 5.8S rRNA
- 5S rRNA

4. **Presence in Cells**: Ribosomes are found in both prokaryotic (like bacteria) and eukaryotic cells (like plant and animal cells). However, the structure and composition may vary between these two types of cells.

5. **Ribosomal Structure**: Ribosomes consist of two subunits: a larger subunit and a smaller subunit. These subunits come together during protein synthesis to form a functional ribosome.

6. **Conclusion**: Therefore, the correct answer to the question "Besides proteins, ribosomes contain" is **RNA**.