After the power supply is switched on, some amino acids may not travel and remain stationary. Suggest an explanation for this observation.
The amino acid glycine has the formula $\text{H}_2\text{NCH}_2\text{CO}_2\text{H}$. Identify the species present on the filter paper if glycine moves to the left (positive) end of the filter paper.
A different electrophoresis gave the result below. What can be deduced about the relative sizes and charges of amino acid species A, B and C?
After a partial hydrolysis, these tripeptides were obtained from a particular polypeptide: ala-gly-asp, gly-ala-gly, lys-val-ser, ser-ala-gly, val-ser-ala. Since the N-terminal amino acid is lysine (lys), suggest the amino acid sequence of the shortest polypeptide that could produce the tripeptides above.
Which tripeptide in (i) has the lowest $M_r$?
Select one amino acid from those listed in the table that has an ionic side-chain at $\text{pH } 8$.