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Solubility of Amino Acids

APCHEM-NXIIJQ

In biological systems, some amino acids are more soluble in water due to the hydrophilic regions.

Based on the structures of the amino acids pictured, which of the following would be the LEAST soluble in water?

A

Histidine.

By Vaccinationist (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons

B

Lysine.

By Ben Mills (Own work) [Public domain], via Wikimedia Commons

C

Alanine.

By NEUROtiker (Own work) [Public domain], via Wikimedia Commons

D

Cysteine.

By NEUROtiker (Own work) [Public domain], via Wikimedia Commons