Fill in the blanks:
___________ is the basic unit of nucleic acid.

Explanation

**Step-by-Step Solution:**

1. **Understanding Nucleic Acids**: Nucleic acids are essential biomolecules that store and transmit genetic information. They are composed of smaller units.

2. **Identifying the Basic Unit**: The basic unit of nucleic acids is known as a nucleotide. Nucleotides are the building blocks that make up DNA and RNA.

3. **Components of Nucleotides**: Each nucleotide consists of three components: a phosphate group, a sugar molecule (deoxyribose in DNA and ribose in RNA), and a nitrogenous base (adenine, thymine, cytosine, or guanine).

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