An alternative method to methylate homocysteine to form methionine iswhich one of the following A: Using glycine and FH4 as the methyl dono B: Using dimethylglycine as the methyl dono C: Using choline as the methyl dono D: Using sarcosine as the methyl dono E: Using betaine as the methyl dono

Why was Directed Studies dubbed Directed Suicide by Yalies?

Methyl and acetyl groupes can be added to the tails of histones.

聚甲基丙烯酸甲酯（Polymethyl methacrylate，PMMA）的单体是 A: 甲基丙烯酸（Methacrylic acid） B: 丙烯酸甲酯（Methyl acrylate） C: 甲基丙烯酸甲酯（methyl methacrylate）

"now a historic site that Carter formerly directed" directed here means? A: managed B: visited

______ any film before, his first attempt was a great success. A: [A] Though having never directed B: [B] Despite he had never directed C: [C] As he had never directed D: [D] In spite of his never having directed

"now a historic site that Carter formerly directed" in paragraph 3， directed here means? A: managed B: visited

The ABC excinuclease is essential in:() A: base-excision repair. B: methyl-directed repair. C: mismatch repair. D: nucleotide-excision repair. E: SOS repair.

Was that remark directed _____ me? A: in B: to C: with D: at

Moods are intense feelings that are directed at someone or something. （ ）