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17 - Refer to the folloiiiiI ing paagraph and figure 3.1 to...

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Unformatted text preview: Refer to the folloiiiiI ing paagraph and figure 3.1 to EI'IMET the following questions. Figure 3.1 Ence structure correlates so well with function. hioohem istsare constantly looking for new ways to probe theoomplex structure of proteins in order to understh w hat they do and how they do it. IIZIne of the most powerful techniques in existence today is X- ray crystallogrmhy. The main difficulty with this technique isgetting the protein tocrystallize. Dnce crystallized. the protein is homba'ded with x- raystooreateapsltern that can beanalyzed mflhemstioslly todetermine the three dimensional structure of the protein. This analysis has been performed by Krzysztof Falozew ski on the protein rhodopsin. w hich is a light- sensitive protein found in species ranging from ancient bacteria {archsea} to humms. The structure [schem atically shew n above. us here each letter represents an amino acid} ischaracterized by a single poly peptide chain with severfl a— helical segments thfl loop Isaiah and forth across the cell membrane. Another notdlle feature is the disulfide bond {— S— S- ]thfl can be seen flthe bottom of the third trensmem brine segment. [Figure adapted from K. F'alozewski et EL &:ienoe W {31130}: ?39.] 115} How many times does the protein in Figure 3.1 cross the cell membra'le‘i‘ 115} A} 1 B} 3 C] 4 D} 7 11a} If you were reading off the sequence of amino acids in Figure 3.1 to a biologist friend. whfl should 1 I E} the first three letters be? A} M-N—G B} A—P—A C] It doesn't mater. since the protein hasno polaity or directionality. 117} What isthe location of the (3- term inus of the protein in Figure 3.1? 11?} A} nucleus B} embedded within the membrane G] cytoplasm D} extrmellular ‘lT ...
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