ch03.2 - Review Turn on your remote if you have one. How do...

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Unformatted text preview: Review Turn on your remote if you have one. How do you vote? Turn on the clicker by pressing the bottom “On/Off” button. A blue “Power” light will appear at the top of the remote. How do you know your vote was received? Check your “Vote Status” Light: – Green light = your vote was sent AND received. – Red fashing light = you need to vote again. Not sure you saw the light ? Just vote again. Want to change your vote ? You can vote again until the timer is stopped. Scoring and Registering You earn participation points for your iClicker responses: 80% for each question answered 100% for each correct answer e.g. 1.6 X 5 questions = 8 + 0.4 each correct max 10 points/lecture (drop 3 lowest) Until you register your i>clicker, your responses are tied to your clicker remote ID (located on the back of your clicker). After you register, your previously recorded voting responses will be assigned to you. At the center of all 20 standard amino acids is what is termed the α-carbon that is covalently bonded with four other chemical groups. Which of these four chemical groups is not a normal component of all amino acids? A. an amino group B. a carboxyl group C. a side chain (R group) D. a methyl group 3-2 α Is the α carbon a chiral center? R C COOH H NH 3 + R C COO- H NH 2 R C COO- H NH 3 + H + H + Proton donor (acid) Proton acceptor (base) zwitterion Acid/base properties of amino acids Amino acids are amphoteric compounds (or ampholytes) -- they can act as either an acid or a base… 3-10 pI = pK 1 + pK 2 2 Titration curve for amino acid glycine - a diprotic acid Isoelectric point For amino acid without ionizable R group: pI = pH where net charge is zero 3-13 Peptide bond formation 3-14 Oligopeptide Polypeptide Protein Protein Purifcation...
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This note was uploaded on 11/02/2009 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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ch03.2 - Review Turn on your remote if you have one. How do...

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