Relate the structure of an amino acid to its chemical structure and role by matc
ID: 1087292 • Letter: R
Question
Relate the structure of an amino acid to its chemical structure and role by matching the letters a-h with the numbers i-viii:
Methionine
Valine
Proline
Cysteine
Tryptophan
Glycine
Glutamate
Lysine
provides least amount of steric hindrance
R group has a pKa near 4 and is negatively charged at pH 7
participates in the formation of disulfide bonds
is partially responsible for absorbance of light at 280 nm
only amino acid with substituted -amino group, forces bend in chain
R group has a pKa of 10.5, making it positively charged at physiological pH
sulfur containing group that does not participate in disulfide bonds
saturated hydrocarbon group, important for hydrophobic interactions
Explanation / Answer
methionine = sulfur containing group that does not participate in disulfide bonds
trptophan = responsible for absorbance of light at 280 nm
cysteine = participate in disulphide bonds
glycine = provide least steric hindrance
valine = saturated hydrocarbon group for hydrophobic interaction
proline = amino acid with substituted alpha-amino acid forces bend in chain