The branch of the U.S. government that is composed of the president and all the individuals, agencies, and departments that report to the president, and that is responsible for administering and enforcing the laws that Congress passes.
Proteins are biological polymers composed of amino acids. Amino acids, linked together by peptide bonds, form a polypeptide chain. One or more polypeptide chains twisted into a 3-D shape form a protein. Proteins have complex shapes that include various folds, loops, and curves.
Amino acids are building block of proteins. Amino acids form peptide linkage with each other to form protein through condensation polymerization with the elimination of water molecule. Each amino acid consist of two functional groups; amino group (-NH 2) and carboxyl group (-COOH) on same carbon atom.