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Atoms of the four elements Carbon, Hydrogen, Oxygen and Nitrogen combine with traces of other elements to produce the molecules that make up the building blocks of our cells, amino acids.

DNA (deoxyribonucleic acid) in the nucleus of cells acts as both the "hardware" and "software" of a system that uses amino acids to create proteins. Proteins made by RNA from DNA with the help of enzymes are part of a feedback loop that makes the system (in this case, humans) operate. Atoms are put together one at a time by enzymes encoding them from the information contained in DNA. That is how humans can be made from near-uncountable numbers of individual atoms. The atoms combine into molecules, some very large, which combine in unique ways to create cells. Cells make up the tissues of the body, which in turn make up the organs and systems of the body.

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14y ago

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