Here's a breakdown:
* DNA structure: DNA consists of two long strands of nucleotides. Each nucleotide is composed of a sugar (deoxyribose), a phosphate group, and one of four nitrogenous bases: adenine (A), guanine (G), cytosine (C), and thymine (T).
* Base pairing: The two strands are held together by weak hydrogen bonds between the bases. These bonds form specifically between:
* Adenine (A) and Thymine (T) - two hydrogen bonds
* Guanine (G) and Cytosine (C) - three hydrogen bonds
* Double helix: This specific base pairing results in the iconic double helix structure of DNA, where the two strands twist around each other like a ladder.
These hydrogen bonds are relatively weak individually, but collectively, they are strong enough to hold the two strands together, creating a stable and organized molecule. This stability is crucial for DNA's role as the genetic material, ensuring accurate replication and transmission of information.
