Identify the noncovalent interaction that results in proteins folding into a globe-like shape, forming a 'water-loving' exterior. Give two examples of amino acids that will have this interaction.

• A. Hydrophobic interaction. Examples of amino acids that can form this interaction are valine and phenylalanine.
• B. Hydrophilic interaction. Examples of amino acids that can form this interaction are threonine and glutamine.
• C. Ionic interaction. Examples of amino acids that can form this interaction are aspartic acid and arginine.
• D. Hydrogen bonding. Examples of amino acids that can form this interaction are asparagine and serine.

Answer: (A)