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.
Explain how a peptide bond forms between two amino acids. A peptide bond links the carboxyl group of one amino acid with the amino group. List and describe the three major components of an amino acid. Explain amino acids may be grouped according to the physical and chemical properties of the R group. At the pH in a cell, the amino and carboxyl groups are usually ionized.