Please choose one from parentheses . If possible, provide the explanation of the solution X-Ray crystallographic analysis of a protein crystal sometimes fails to reveal the positions of the first few residues of a polypeptide chain. In a protein crystal, the residues at the end of a polypeptide chain may experience
(fewer/more) intramolecular contacts and therefore tend to be (less/more) ordered (less/more) mobile in the crystal). If their (order/disorder) prevents them from generating a (incoherent/coherent) diffraction pattern. It mat be impossible to map their electron density.