Which of the following pairs of amino acids could form a hydrogen bond through their R-groups?
A)serine and phenylalanine
B)aspartic acid and methionine
C)histidine and tyrosine
D)alanine and glutamine
E)leucine and cysteine

Question

Quizplus · Accepted Answer

Histidine and tyrosine both have polar R-groups that can participate in hydrogen bonding. Serine also has a polar R-group, but phenylalanine has a non-polar, hydrophobic R-group. Aspartic acid has a negatively charged R-group, while methionine has a non-polar R-group. Alanine has a non-polar R-group, while glutamine has a polar R-group. Leucine has a non-polar R-group, while cysteine has a polar R-group that can participate in hydrogen bonding, but also forms disulfide bonds.

Which of the Following Pairs of Amino Acids Could Form