Double Helix (DNA structure)

The double helix is the structure of DNA, which carries genetic information. Imagine two long strands made of smaller units, called nucleotides, twisted around each other like a spiral staircase. Each strand's sides are composed of sugar and phosphate molecules, while the steps are pairs of nitrogen bases (adenine with thymine, cytosine with guanine). These bases form specific pairs, holding the two strands together securely. This twisted, ladder-like shape allows DNA to store, replicate, and transmit genetic instructions efficiently, ensuring that biological information is maintained and passed on accurately.