Ramachandran plot below was generated from calculations of a

Ramachandran plot below was generated from calculations of angles for L-alanine residues n a peptide chain. The shaded regions contain p, values that avoid steric clashes between the peptide chain atoms. The dark green areas contain values that have no steric overlap, which are referred to as \"allowed\" or \"most favorable\" regions. The lighter green areas indicate tolerable steric clashes and are referred to as \"partially allowed\" or \"borderline regions. This plot of calculated L-alanine p, angles has similar green shaded regions as a consensus plot of experimentally determined p, bangles from a variety of proteins Suppose a specific residue in a protein has a negative 180 p value, a positive value, and lies near the center of an allowed region 120 near the center of the region that would contain this residue. 60 3 -60 120 180 Continues below. 80 do (degrees)

Solution

Ans.) The right option is “2”.

Glycine residue is commonly found scattered among the four quadrants. Because it has a very small side chain (hydrogen atom) and therefore has less chance of steric clash.