試題詳解

3. Please choose the correct answer from the following descriptions:

(1) Comparing amino acids "C" and "S", there is only one atom difference.

(2) For two-dimensional gel electrophoresis, proteins were separated according to their molecular weights, then further separated according to their pl values.

(3) Using solid state peptide synthesis to synthesize the peptide "SMART", the synthesis sequence is T-R-A-M-S.

 (4) Phenylisothiocyanate is used to do chemical fragmentation on methionine residues.

 (5) Evolutionary relatedness can be inferred from sequence homology. Lysozyme and α-lactoalbumin are identical at 48 positions but their functions are not related. It is called "convergent evolution".
(A) Only 1 and 3 are incorrect.
(B) Only 2 and 4 are incorrect.
(C) Only 2, 4 and 5 are incorrect.
(D) Only 3 is correct.
(E) Only 1 and 5 are correct.