1 - Net ID BioMG 3310 QUIZ 1a 9/8/10 1. (9 pts) Draw the...

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Net ID BioMG 3310 QUIZ 1 a 9/8/10 1. (9 pts) Draw the structure of the dipeptide Ser-Cys at pH 10 . Draw all atoms . Label both α and both β carbons. Show the correct form of each ionizable group. 2. (9 pts) Hemoglobin has a Lys and a terminal carboxyl that are close to each other. Estimate the fraction of all these Lys---carboxyl neighbors that would be in an ion-pair bond at the following pH values. Circle the one best answer from the choices that follow the pH. at pH 3 {1.0} {0} {1/10} {1/100} {9/10} {1/2} {2/3} at pH 4 {1.0} {0} {1/10} {1/100} {9/10} {1/2} {2/3} at pH 10 {1.0} {0} {1/10} {1/100} {9/10} {1/2} {2/3} 3. (5 pts) PyMOL questions about the image on the right (also projected on the screen): a. Circle the one menu choice below that gave the image shown. [lines sticks ribbons cartoons spheres branches rods] b. Directly on the image, circle the peptide bond(s) c. Directly on the image , draw a circle around the terminal amino group, and a square around the terminal carboxyl group. 4. (3 pts) Consider the amino acids glycine, lysine, and glutamate at pH 7. Gly-Lys-Glu is a tripeptide. Write in the correct answers below: a. Compared to the free AA, how many + charges are lost when the tripeptide forms? ___ b. Compared to the free AA, how many - charges are lost when the tripeptide forms? ___ c. Compared to the free AA, the tripeptide has (circle the correct answer)
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This note was uploaded on 01/01/2012 for the course BIOMG 3310 taught by Professor Feigenson during the Fall '11 term at Cornell.

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1 - Net ID BioMG 3310 QUIZ 1a 9/8/10 1. (9 pts) Draw the...

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