|What is it?|
macromolecules. They are constructed from one or more unbranched
chains of AMINO ACIDS;
that is, they are polymers. A typical protein contains 200-300 amino acids
but some are much smaller (the smallest are often called peptides) and
some much larger (the largest to date is titin a protein found in
skeletal muscle; it contains some 27,000 amino acids in a single chain!).
Every function in the living cell depends on proteins.
Foods that supply the body with protein include animal
products, grains, legumes, and vegetables. Proteins from animal sources
contain the essential amino acids. Proteins are changed to amino acids
in the body. For detailed information regarding proteins to to