Leucine, alanine, and tryptophan are amino acids that are hydrophobic. That is, they are nonpolar and do not dissolve well in water. Serine, threonine, and asparagine on the other hand are polar amino acids, which means they do dissolve in water. Which pair of amino acids would MOST LIKELY come together in a folded protein?

a. leucine and serine
b. alanine and threonine
c. asparagine and alanine
d. alanine and tryptophan