practice_midterm2_2007

practice_midterm2_2007 - Name: Last First Student ID:...

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Name: Last First 1 Student ID: Please put your name on every page. BIS 102, Fall 2007 Practice Midterm 2 Professor Toney
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Name: Last First 2 Short Answers (points as indicated; 40 pts total) 1. (4 pts) Draw the complete chemical structure of the tripeptide M-R-L in its ionization state at pH 7.0. 2. A. (2 pts) Use a simple but clear drawing to illustrate the difference between a parallel and an anti-parallel β sheet. B. (1 pt) In which structure would you more frequently see a β turn? 3. (4 pts) Write a brief, one sentence definition of the following terms: A. Primary structure B. Secondary structure C. Tertiary structure D. Quaternary structure
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Name: Last First 3 4. A) (3 pts) Draw the complete structure (including charges) of a dipeptide containing a hydrophobic and a polar but uncharged amino acid at pH 7.0. B) (2 pts) Mark the backbone bonds about which no rotation is allowed with a star, and the bonds used to generate a Ramachandran plot with an arrow. C) (4 pts) What approximate region of the Ramachandran plot is allowed for: A. α -helix B. β -sheet 5. (2 pts) A peptide 18 amino acids long completely forms an α -helix in trifluoroethanol. How many turns does the helix have? 6. (3 pts) List three types of secondary structure commonly found in globular proteins: A . B . C .
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Name: Last First 4 7. Enzyme Z catalyzes the reaction: A + NAD + B + NADH + H + The reaction can be monitored spectroscopically at 340 nm. This is the wavelength at which NADH absorbs light. Some of the first enzymes that were worked on in biochemistry were dehydrogenases, like our enzyme Z, because of this advantage.
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practice_midterm2_2007 - Name: Last First Student ID:...

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