Dna is the code of life. It is the blueprint for our bodies and determines our physical characteristics. It is also responsible for passing on our genetic information from one generation to the next.Dna is made up of two long chains of molecules called nucleotides. These chains are coiled around each other to form a double helix. The order of the nucleotides in the dna chain determines the sequence of amino acids in proteins, which in turn determines the structure and function of those proteins.The human dna molecule contains about 3 billion nucleotides and approximately 20,000 genes. Genes are sections of dna that contain the instructions for making proteins. Proteins are essential for the structure, function, and regulation of our cells, tissues, and organs. They also perform many important tasks in our bodies, such as enzymes that catalyze chemical reactions, hormones that regulate metabolism, and antibodies that protect us from infection.
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