Which one of the following amino acids is most likely to be found in the transmembrane region of a protein: (A) Lysine, (B) Arginine, (C) Leucine, (D) Aspartate
Answer is C. Hydrophobic or Nonpolar amino acids are present in transmembrane region.
Hydrophillic or polar amino acids are present on outer surface of membrane.
Leucine is a hydrophobic a.a. so it lies in transmembrane region.