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The nucleus contains chromosomes, made up of genes, which are made up of a chemical called DNA (Deoxyribonucleic acid).

DNA contains instructions for making a cell and telling it what to do.

These instructions are called the genetic code.

Gene - Length of protein which gives instructions for making a certain protein

enzymes are a group of protein which control all chemical reactions in cells.

a DNA molecule is shaped like a twisted ladder (a double helix)

The sides are made of…


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