You could be depressed from a lot of different things, from losing your job to someone passing away
Long chains of amino acids used for building, repair, and maintenance.
Proteins are polymers of amino acids. There are a fixed set of amino acids that are involved in the making of a protein. These amino acids are varied in number and type to give rise to different combinations in a polymer. This creates a diversity of protein molecules.
The amino acids link to other amino acid in the polymer through the formation of a peptide bond between them. It forms when the carboxylic group of one amino acid molecule reacts and binds to the amino group of the other molecule.
I think it's True.. ((:
http://www.chemguide.co.uk/physical/basicrates/catalyst.html
That might help ^
