The repeated units of DNA molecule.

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Repeated Unit of DNA**: The question asks for the repeated units of a DNA molecule. The basic building block of DNA is known as a nucleotide.

2. **Define Nucleotide**: A nucleotide is the fundamental unit of DNA and is composed of three main components:
- **Phosphoric Acid**: This part of the nucleotide forms the backbone of the DNA strand.
- **Nitrogenous Base**: This is the part of the nucleotide that varies and is responsible for the genetic coding.
- **Deoxyribose Sugar**: This sugar molecule is also part of the backbone of the DNA.
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