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.
Monomers of proteins are called amino acids, they combine in chains to form proteins in humans 20 different amino acids (monomers) are combined in different orders to make aâ¦ll the different proteins in the body some bacteria use one or two extra amino acids as well as the 20 found in humans.