University of Illinois, Urbana ChampaignMCB 354MCB354FA16_PS02_KEY IN LINE WITH NEW SYLLABUS 2021

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Question 1 The PDB file for Ca2+-bound calmodulin (PDB code 1EXR) was determined from a crystal with unit cell dimensions a = 25.0 Å, b = 29.4 Å, and c = 52.8 Å. The X-ray source had a wavelengt... h of 0.886 Å. Considering only diffraction planes parallel with the b-c plane, i.e. Miller indices (h 0 0), give the diffraction angle for the first and second order reflections. Bragg’s Law: 2 d sin = n  The spacing between diffraction planes is equal to the unit cell dimension a = 25.0 Å. For the first order reflection: 2  25.0 sin = 1  0.886 and therefore  = 1.02 For the second order reflection: 2  25.0 sin = 2  0.886 and therefore  = 2.03  The diffraction angles (diffraction angle = 2) are 2.04 and 4.06. [Show More]

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