Question

下列多肽在人消化道中水解时，不可能产生的氨基酸是

           O         O          O         O          O

          ‖          ‖          ‖         ‖          ‖

NH₂—CH—C—N—CH₂—C—N—CH—C—N—CH—C—N—CH₂—C—OH

     ︱      ︱          ︱  ︱      ︱ ︱     ︱

    CH₂      H          H   CH₃    H  CH₂     H

    ︱                               ︱

    SH                              CH₃

A．  H                       B.        H

     ︱                                ︱

CH₃—C—COOH                    CH₂—C—COOH

     ︱                             ︱  ︱

     NH₂                                         NH₂ NH₂

 

C.   H                       D.         H

     ︱                                 ︱

CH₂—C—COOH                      H—C—COOH

︱   ︱                                 ︱     

SH     NH₂                                               NH₂

Answer 1

B