2 - Net ID BIOBM3310 Quiz 2a 1(9 pts The Ramachandran Map...

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Net ID _______________ BIOBM3310 Quiz 2a 9/17/08 1. (9 pts) The Ramachandran Map on the right shows T / F dots and entire dark areas that are prohibited by steric hindrance T / F regions that correspond to α -helices and β -sheets, but not turns or collagen structure. T / F the calculated, but not the observed, values of φ and ψ Directly on this plot, draw a square around the entire region where α -helices show up in proteins. Directly on this plot, draw a circle around the entire region where β -sheets show up. Directly on this plot, draw a triangle that includes most of the φ and ψ values for myoglobin. 2. (7 pts) Draw ONLY THE SIX ATOMS that are constrained to lie in a plane because of the properties of the peptide bond. Draw no other atoms! Label the two C α . Show with an arrow and a label the bond that allows the φ rotation, and the bond that allows the ψ rotation. Show with an arrow labeled "PARTIAL" the bond (not a carbonyl) that has partial double bond character. 3. (7 pts) This question is about a newly discovered "protein X". Match the words in the left column with the description in the right column. Use a letter only once. ____ the fold of protein X A. easily found from just a portion of the amino acid sequence ____ it has a zinc finger B. must be a water-soluble protein ____ the interior is entirely nonpolar AA C. this is the holoprotein ____ a heme group is bound D. must have some (maybe a lot) of β -sheet ____ ring-stacking stabilizes protein X E. must be located on the surface of protein X ____ an amphipathic helix F. must be some Trp, Tyr, Phe in this protein ____ many H-bonds are between strands G. requires solving the entire 3d structure 4. (7 pts) a. Select T if true, F if false, for the descriptions below about this image:
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2 - Net ID BIOBM3310 Quiz 2a 1(9 pts The Ramachandran Map...

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