試題詳解

26. Peptide A has amino acid sequence "CKGHNLRYEKDSAI". 　

1. Sophia used trypsin to digest the peptide. She obtained a pentapeptide. The pI of this pentapeptide is higher than 10. 　

2. Peptide A does not contain any residue with two chiral centers. 　

3. Peptide A contain only one aromatic residue. 　

4. Peptide A does not contain any residue which could be phosphorylated. 　

5. Peptide A does not contain any residue which could be modified with N-linked glycan in glycoproteins.
(A) 3, 5 are correct.
(B) 1, 3 are correct.
(C) 1, 3, 4 are correct.
(D) 1, 4 are incorrect.
(E) 2, 3 are correct.