DNA DNA Deoxyribonucleic acid (; DNA) is a molecule composed of two chains that coil around each other to form a double helix carrying the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms and many viruses. DNA and ribonucleic acid (RNA) are nucleic acids; alongside proteins, lipids and complex carbohydrates (polysaccharides), nucleic acids are one of the four major types of macromolecules that are essential for all known forms of life. The two DNA strands are also known as polynucleotides as they are composed of simpler monomeric units called nucleotides. Each nucleotide is composed
Amino acid-based formula Amino acid-based formula Amino acid-based formula, also known as an elemental formula, is a type of hypoallergenic infant formula made from individual amino acids. Amino acids are the building blocks of protein and together they form the protein requirements in formula needed for growth and development. The amino acids are in the simplest form, making it easy for the body to process and digest. "Neocate", "EleCare" and "Nutramigen Puramino" are the more commonly encountered brands of amino acid-based formula in the US. Because infants and children have different nutritional needs, amino acid-based formulas are typically formulated either for infants 0–1