DNA is a polymer made up of repeating monomer units.
State the three components that join together to make up a single DNA nucleotide.
The length of a DNA double helix increases by 0.34 nm0.34\text{ nm}0.34 nm for every pair of nucleotides. The total number of nucleotides in a cell of a particular species of plant is 9.0×1099.0 \times 10^99.0×109.
Calculate the total length of the DNA double helix in this plant cell. Give your answer in metres.