Which sequence is correct according to the procedure of PCR ?() A: denaturation → extension → annealing B: denaturation → annealing → extension C: annealing → denaturation→ extension D: Extension → annealing → denaturation

DNA变性(DNA denaturation)

DNA变性（DNA denaturation）

核酸的变性、复性（denaturation、renaturation）

PCR<br/>process includes three steps, they are() A: denaturation B: annealing C: extention D: cooling

Essential of DNA denaturation is ( ). A: Break of phosphodiester bonds B: Rupture of hydrogen bonds C: Break of secondary bonds D: Destruction of base stacking

在一定理化因素作用下，核酸双螺旋等空间结构中碱基之间的氢键断裂，变成单链的现象称为变性（denaturation）。

Among the following phenomena, ( ) is not the main manifestation of the effect of denaturation on protein. A: The solubility of protein increases B: The protein's water holding capacity drops C: Protein is easily digested and absorbed D: The biologically active protein loses its biological activity