Here's a breakdown:
* Nitrogenous Bases: DNA has four nitrogenous bases: Adenine (A), Thymine (T), Guanine (G), and Cytosine (C).
* Base Pairing: A always pairs with T, and G always pairs with C. This is called complementary base pairing.
* Hydrogen Bonds: These are weak chemical bonds that form between the hydrogen atom of one base and the oxygen or nitrogen atom of the other base.
* Double Helix: These hydrogen bonds hold the two strands together, creating the characteristic double helix shape of DNA.
In summary, it's the specific pairing of bases (A-T and G-C) and the hydrogen bonds formed between them that keep the DNA molecule intact.
