A compound that contains at least one hydrogen atom and can react with a base to form a salt; a chemical with a pH less than 7. An example of acid in the body is hydrochloric acid (HCl) involved in digestion in the stomach.
One of a group of chemical compounds (organic acids) that have an amino group (NH2); many are the building blocks of proteins.
The unique genetic code found in all living cells (bacteria, viruses, parasites, plants, and animals).