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.
Key Points Summary. 1  Proteins are made up of amino acids which determine the types of bonding and interaction they can take part in. 2  Amino acids form non-covalent bonds between themselves and other molecules, such as Hydrogen bonds, charge-charge interactions, Van der Waals forces or hydrophobic interactions.