16.於球型蛋白質結構中，下列何組胺基酸之側鏈易形成疏水性交互作用力 (hydrophobic interaction ) ? (A)絲胺酸（serine)與半胱胺酸(cysteine ) (B)苯丙胺酸（phenylalanine )與異白胺酸（isoleucine) (C)天門冬胺酸（aspartic acid )與精胺酸(arginine ) (D)酪胺酸（tyrosine )與蘇胺酸(threonine)