Polar amino acids are hydrophilic and would be located on the exterior of proteins.

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Polar amino acids have a partial or full charge separation within their side chains, making them hydrophilic and attracted to water molecules. Therefore, they tend to be located on the exterior of proteins where they can interact with the aqueous environment. This is in contrast to nonpolar amino acids, which are hydrophobic and tend to be located on the interior of proteins where they can be shielded from water.

Polar Amino Acids Are Hydrophilic and Would Be Located on the Exterior