[问答题]
1.Enzymes are needed for genetic modif q u)pt3k7 sdmwn3dk.8iar,*e;,)dsbu a xp 4tjcation. Outline the role of named enzymes in geneti)j*,,r4but sd pea ;xac modification.
2.Outline the stages of the polymerase chain reaction (PCR).
3.Discuss the potential risks and benefits associated with Bt corn.