試題詳解

75. Which of the following statements about amino acids is CORRECT? ① Methionine is sulfurcontaining amino acids. ② The UV absorbance of phenylalanine at 280 nm is lower than that of tyrosine. ③ Disulfide bond can be reduced by performic acid. ④ The side chain of histidine is an imidazole ring. ⑤ The pI value of arginine is lower than that of lysine.
(A) ①,②,③
(B) ①,③,④
(C) ②,③,④
(D) ①,②,④
(E) ②,③,⑤