Key+Midterm

Key+Midterm - 1 NAME: _ . Last, First BIOLOGICAL SCIENCES...

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NAME: ____________________________ . Last, First BIOLOGICAL SCIENCES 102, Section 2, Fall Quarter MIDTERM EXAMINATION October 24, 2011 Fall Quarter Dr. Marilynn Etzler The grades on this midterm ranged from 20 to 94 points out of 100. They were distributed as follows: 90 – 100 = 5 80 – 89 = 29 70 – 79 = 35 60 – 69 = 45 50 – 59 = 18 40 – 49 = 34 < 40 = 17 Answers are shown on the next pages in red. Copyright © UC Regents Davis campus, 2005-11. All Rights Reserved. May not be re-distributed without prior written consent of course instructor. 1
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1. The structure of a peptide is shown below. O O O O O N CH N CH N CH N CH N CH N CH H 2 C C C C C COO - CH 3 H H H H H H CH 2 CH 3 CH 2 CH 2 CH 2 CH 3 CH 3 S C=O NH 2 H 2 COH CH 1 2 3 4 5 6 Please answer the following questions: a. (12 pts) Each amino acid in the peptide above is designated by a number beneath it. Beside each number below, write the name of the corresponding amino acid. (1) ___ Alanine ____________ (4) ___ Glutamine __________ (2) ___ Glycine ____________ (5) ___ Serine _____________ (3) ___ Methionine _________ (6) ___ Valine _____________ b. (4 pts) Using numbers for your answer , show the fragments that would be obtained upon treatment of the above peptide with cyanogen bromide. _______ 123 and 456 _____________________ c. (4 pts) Using numbers for your answer , indicate which of the amino acids in the above peptide have R groups that could participate in hydrogen bonds. _____ 4 and 5 __________________ d. (4 pts) If the above peptide were in its fully protonated form, what would be its net charge? _____ + 1 _________ e. (4 pts) Circle the peptide bond in the above peptide that is closest to the amino terminal end of the peptide.
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Key+Midterm - 1 NAME: _ . Last, First BIOLOGICAL SCIENCES...

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