BIO 1213 Lecture Notes - Lecture 3: Zwitterion, Amine, Ammonia

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Amino acids and their polymerization: amino acids are the monomers (building blocks) of proteins, there are 20 types of amino acid, all of which have the same general make-up: Nh2 amino functional group n - terminus. Cooh carboxyl functional group c- terminus. R- group (also called side chain) different combination of atoms which gives each amino acid their unique characteristics. In a neutral ph (7) like water, the amino acid will ionize. This form of the amino acid in water is called zwitterion (2 charges, negative and positive at the same time) The charge on amino acids will allow it to interact with the water molecules as well as other charged substances to form bonds. The carboxylic group (cooh) will donate a proton (h+) to become coo- The amino group (nh2) will accept a proton (h+) to become nh3+ In a solution with a low ph (high acidity + high hydrogen protons):

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