Question

下列關(guān)于基因工程說法正確的有幾項（  ）                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

①一種限制性核酸內(nèi)切酶只能識別一種特定的脫氧核苷酸。

②若要生產(chǎn)轉(zhuǎn)基因抗病水稻，可將目的基因先導(dǎo)入到大腸桿菌中，再轉(zhuǎn)入水稻細(xì)胞中。

③載體上的抗性基因有利于篩選含重組DNA的細(xì)胞。

④基因工程中，外源基因可以從基因庫中直接獲取。

⑤轉(zhuǎn)基因植物的培育利用了細(xì)胞的全能性。

⑥可以利用基因工程培育生物的新物種。

A．一項          B．二項          C．三項       D．四項

Answer 1

B