Question

select amino acids that are most likely to be found in the interior of a protein.
lysine
glutamic acid
phenylalanine
valine
leucine

Explanation:

Protein interiors are hydrophobic (water-avoiding) regions, so nonpolar amino acids tend to cluster here. Lysine and glutamic acid are polar/charged (hydrophilic), so they stay on the protein surface. Phenylalanine, valine, and leucine have nonpolar side chains, making them suited for the interior.

Answer:

• Phenylalanine
• Valine
• Leucine