Summary/paraphrase 2

Every living organism is composed of trillions of cells. The chromosomes in cell carry critical information about their functioning. Genes determine the production of enzymes and specific proteins in the cell. These are made up of four different chemicals called nucleotides that contain one of four molecules.The nucleotides link together in one of two kinds of pairings to form the structure called DNA. Each gene has a specific pairs of nucleotide according to different order on DNA ladder that we call the chromosomes. Therefore, every gene is different from each other.