These free radicals are dangerous to body cells because they can damage essential molecules such as DNA and the enzymes necessary for proper function of cells. (nakedfoodmagazine.com)
Certain amino acids are the building blocks of proteins, essential molecules used by life to build structures like hair and skin and to regulate chemical reactions. (sciencedaily.com)
Life on earth is dependent on the process of photosynthesis, which captures light energy and carbon dioxide to create essential molecules. (btiscience.org)