Nucleic acid exhibit secondary structure. Describe through Watson-Crick model.

Explanation

To describe the secondary structure of nucleic acids through the Watson-Crick model, we can break down the explanation into several key steps:

### Step-by-Step Solution:

1. **Definition of Nucleic Acids**:
- Nucleic acids are biomolecules essential for life, primarily DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). DNA consists of four nitrogenous bases: adenine (A), guanine (G), thymine (T), and cytosine (C). RNA contains uracil (U) instead of thymine.

**Hint**: Remember that nucleic acids are made up of nucleotides, which consist of a sugar, a phosphate group, and a nitrogenous base.
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