2. Please choose the correct answer from the following descriptions:
 1. Dextran is homopolysaccharide and the material for beads in gel filtration.
 2. Agarose is the material for making SDS gel.
 3. Heparin is sulfated hetereopolysaccharide. 
 4. The strength of a-keratin depends on its Cys content.
 5. Hydrogen bond in a-helix formed between residue i and i+4.
(A) I and 3 are incorrect.
(B) 2 and 5 are incorrect.
(C)2 and 5 are correct
(D) Only 2 is incorrect.
(E) Only 3, 4, and 5 are correct.

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統計： A(0), B(0), C(0), D(0), E(1) #2724326