IMPORTANT BIOLOGICAL COMPOUNDS-part 3.docx

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Department
Biology
Course Code
BIOL 151
Professor
Jaclyn Vick

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Description
Proteins: - simple structure, but increasing level of complexity - Monomers= amino acids (aa) - Chains of aa= proteins - Central C bonded to 4 functional groups (4 basic components of amino acids) - Amino group (-NH2) - Carboxyl group (-COOH) - Hydrogen (H) - ‘R’ group---- what determines properties of aa - Monomers of amino acids (aa) held together by peptide bonds form peptides - Formed by dehydration synthesis - Peptide bond= N of (-NH2) of 1 aa is joined to C of (COOH) of another aa - Form peptides - You combine one aa and another aa and you get a fully functioning 4 levels of protein protein and a water structure: st - 1 level: primary structure: like the letters in a word. You attach one letter to another to another, to form a chain. The sequence of amino acids in a polypeptide chain, similar to the sequence of letters that spell out a specific word • (The sequence of amino acids on that chain.) - 2 level: secondary structure: the corkscrew-like twists or pleated folds formed by hydrogen bonds between amino acids in the polypeptide chain • (hydrogen bonding between amino acids) • The 2 most common patterns: ** twist in a corkscrew-like shape or **zig-zag folding
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