Biology - Genetics - Basic - DNA structure - DNA Structure Explained
5 steps. Step 1: 'DNA is shaped like a DOUBLE HELIX - a twisted ladder. Two strands wound around each other.' Show the overall shape. Step 2: 'The BACKBONE is made of alternating sugar (deoxyribose) and phosphate groups. This is the 'railing' of the ladder.' Show backbone structure. Step 3: 'The RUN