Middle back pain is any type of pain or discomfort in the area between your upper and lower back. Health care professionals refer to this area as the lower thoracic area or lower thoracic spine. The upper thoracic area or upper thoracic spine makes up part of the upper back.
Amino Acids. Amino acids are the monomers of proteins. They have a positively-charged amino group on one side and a negatively-charged carboxyl group on the other. Attached to the central carbon is a variable group called the 'R' group. This group is different for each amino acid. There are 20 amino acids in human cells.
A protein is a natural polymer made up of amino acid monomers  joined together by peptide bonds. A peptide bond is a covalent bond  formed by a carbon molecule and a nitroge â¦ n molecule.Answered. In Plastics and Polymers.mino Acids are the monomers of proteins. There are 20 kinds of amino acids. 22 people found this useful. Edit. Share to: Judy Olmsted. 78,719 Contributions. Retired college science professor. Member of Beta Beta Beta Biological Honor Society. Member of the American Chemical Society (ACS).