why-might-an-amino-acid-like-histidine-be-categorized-as-both-polar-and-basic

Question

Why might an amino acid like histidine be categorized as both polar and basic?

Accepted Answer

Its imidazole group can acquire a proton, making it polar and basic.

Answer

It contains a sulfur atom, making it polar and basic.

Answer

It lacks any functional group that binds protons.

Answer

Its long carbon chain makes it polar and basic.