1. Please choose the correct answer from the following descriptions:  1. Every turn of a-helix is 10.4 A in length.  2. The side-chain of Histidine is an indole group and has important role inmaintaining pH in blood. 3. Frederick Sanger developed a method for DNA scquencing and won Nobelprize. 4. Dextrin is homopolysaccharide.  5. Trehalose is the inajor constituent in circulating fluid of insects asenergy-storage compound.
(A) Only 2 and 5 are incorrect.
(B) 3, 4, and 5 are cotrect.
(C) 2 and 5 are correct.
(D) All descriptions are incorrect.
(E) Only 1 and 4 are incorrect.