Question

sort the amino acid structures into the correct column by dragging and dropping. some of the amino acids listed may not act as either an acid or base, so all options listed may not be used.
amino acids with acidic r groups (proton donors)
amino acids with basic r groups (proton acceptors)

Explanation:

Step1: Identify acidic R - groups

Amino acids with acidic R - groups have functional groups in the R - group that can donate a proton. Carboxylic acid groups ($-COOH$) in the R - group are acidic.

Step2: Identify basic R - groups

Amino acids with basic R - groups have functional groups in the R - group that can accept a proton. Amino groups ($-NH_2$) or groups with nitrogen that can be protonated in the R - group are basic.

Answer:

Amino acids with acidic R groups (proton donors): Amino acids with R - groups containing carboxylic acid groups like the one with a terminal $-COOH$ in the R - chain.
Amino acids with basic R groups (proton acceptors): Amino acids with R - groups containing amino groups or nitrogen - containing groups that can be protonated like the one with $-NH_2$ in the R - chain.