What are the structural units of nucleic acids?

Explanation

**Step-by-Step Solution:**

1. **Identify the Structural Units of Nucleic Acids:**
- Nucleic acids, which include DNA and RNA, are made up of smaller units known as nucleotides.

2. **Define a Nucleotide:**
- A nucleotide is the basic building block of nucleic acids. Each nucleotide consists of three components:
- A **pentose sugar** (which can be either ribose in RNA or deoxyribose in DNA).
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