2 - Net ID BIOMG 3310 Quiz 2a 1(9 pts The Ramachandran Map...

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Net ID _______________ BIOMG 3310 Quiz 2a 9/15/10 1. (9 pts) The Ramachandran Map on the right shows T / F the calculated Map for poly-Gly 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 for real proteins Directly on this plot, draw a square around the region where α -helices show up in proteins. use one square about this size: Directly on this plot, draw a circle around the region where β -sheets show up. use one circle about this size: Directly on this plot, draw one triangle that includes most of the φ and ψ values for myoglobin. use one triangle about this size: 2. (6 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) You have just solved a protein structure, and you are looking at the result. Match the words in the left column with the description in the right column. Use a letter only once. ____ the fold of this protein A. must have turns and "coil" secondary structure ____ has only one α -helix and no β -sheet B. must be located on the aqueous surface of this protein ____ an amphipathic helix C. has many Pro throughout the structure ____ many “not allowed” φ and ψ are found D. requires solving the entire 3d structure ____ good reason for so few α -helices E. must be a membrane-bound protein ____ many polar residues are on the inside F. has many Phe, Trp, Tyr ____ stabilized by ring-stacking G. has many Gly residues 4. (8 pts) a. Select T if true, F if false, for the descriptions below about this image:
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2 - Net ID BIOMG 3310 Quiz 2a 1(9 pts The Ramachandran Map...

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