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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.