bio Chapter_5-2 - Chapter 5-2: Proteins Extremely important...

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Chapter 5-2: Proteins Extremely important 50% of the dry mass of most cells Proteins are the most structurally sophisticated molecules Polypeptides All proteins are made up of polypeptides A polypeptide is a polymer that is composed of amino acids (monomers) Amino acids are linked by peptide bonds There are only 20 amino acids, but infinite varieties of proteins Amino Acids The same 20 amino acids are used in all life on earth Amino acids have both amino (NH 2 ) and carboxyl (COOH) groups The R group (also called the side chain) is what distinguishes different amino acids Names end in –ine Usually referred to by 3 letter abbreviations (ex. Alanine – Ala) The L enantiomer is always used in organisms The physical and chemical properties of the side chain determine the way an amino acid interacts with its environment Protein Shape and Function
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A functional protein consists of one or more polypeptides precisely twisted, folded, and
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This note was uploaded on 09/18/2011 for the course BIOL 1301 taught by Professor Harden during the Spring '11 term at Lone Star College.

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bio Chapter_5-2 - Chapter 5-2: Proteins Extremely important...

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