Relate the structure of an amino acid to its chemical structure and role by matc
ID: 265266 • 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-vi 1. a. Methionine b. Valine c. Proline d. Cysteine e. Tryptophan f. Glycine g. Glutamate h. Lysine i. provides least amount of steric hindrance ii. R group has a pKa near 4 and is negatively charged at pH 7 ili. participates in the formation of disulfide bonds iv. is partially responsible for absorbance of light at 280 nm v. only amino acid with substituted a-amino group, forces bend in chain vi. R group has a pKa of 10.5, making it positively charged at physiological pH vii. sulfur containing group that does not participate in disulfide bonds vii. saturated hydrocarbon group, important for hydrophobic interactionsExplanation / Answer
a.methionine is sulpher containing group that does not participate in disulphide bonds - vii
b.valine is saturated hydrocarbon group important for hydrophobic intreractions - viii
c.proline is only amino acid with substituted with alpha amino group ,forces bend in chain - v
d.Only cysteine can form disulfide bonds - iii
e.tryptophan is responsible for most of the absorbance of light at 280 nm - iv
f.glycine has much less steric hindrance - i
g.glutamate R group has a pKa near 4 and is negatively charged at pH 7 - ii
h.lysine R group has a pKa of 10.5 and important for hydrophobic interactions? - vi