Question

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

Answer 1

d. alanine and tryptophan.

Step-by-step explanation:

Since alanine and tryptophan amino acids have similar properties (i.e., hydrophobic, non-polar and insoluble) it would be expected that they would repel each other, thereby forming folded protein structures.