MAST382 Lecture Notes - Lecture 2: N-Terminus, Dehydration Reaction, Peptide
1 Sep 2016
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Document Summary
Unity and diversity of life are explained by evolution. Single origin of life, thus all life forms share some characteristics. New species arose by divergence of populations over time. Evolutionary relationships of life based on dna analysis. Bacteria and archaeons look alike, but archaeons have more common genetically w/ eukaryotes. Electronegativity increases as moves to left, decreases as you move down table. Contain c,h, o, n and usually s. Proteins consist of 1 or more polypeptides. The building block, or monomer, is the amino acid. In aq solution, which they usually are since cells are mostly water the carboxyl group donates to amino group. The r group of glycine is nonpolar, and the smallest amino acid. Peptide : linear chains of covalently linked aa more than 50 aa = polypeptide. One side of peptide ends w amino terminus or n-terminus. The other side is carboxyl terminus or t-terminus.
