[问答题]
1.Enzymes are needed for gen(9pj) qasdytz6j)nh 9 * duz9metic m rvs hwlqa3oku9p-5 5.nj9q0htz)x2b odification. Outline the role of named enzymes in genetic modificatiov- 9) t.5p0 32ju9lks hzowrab5xnhqqn.
2.Outline the stages of the polymerase chain reaction (PCR).
3.Discuss the potential risks and benefits associated with Bt corn.
