DNA, genes and chromosomes
The code in DNA is organised into higher structures.
A gene is a section of DNA that codes for a protein. One DNA molecule can contain thousands of genes!
Every protein in the cell has a complementary gene that contains the instructions for making the protein.
In humans, the genetic information is separated into multiple DNA molecules. Each individual DNA molecule is called a chromosome . Human cells have 46 chromosomes, split into 23 pairs.
Bacterial cells typically have a single DNA molecule that contains all of their genetic information.