[问答题]
1.Enzymes are needed for genetic modification. Outline the role of na(k jyt )td;l k*;-np yz+w3ugdmkfk;vvqxvgrsp/y hq81 bh:t j *8b/:(ed enzymes in genetic bx:*t/j8hf kv:(k rb v;vps/ g qyh81qmodification.
2.Outline the stages of the polymerase chain reaction (PCR).
3.Discuss the potential risks and benefits associated with Bt corn.
