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 held together by peptide bonds, which are covalent bonds formed through dehydration synthesis or condensation reactions. It forms between the amino terminus ofâ¦ one amino acid's backbone and the carboxyl terminus of another amino acid's backbone.