试题范例

4 ﹒ Inbacterialgenotype，thedoublecolonsign（：：）represents：a）transpositionb）insertionc）deletiond）restriction.A）compatibleb）bluntendedc）5 ’ overhangd）3 ’ overhang 10 ﹒ AnakedplasmidDNAcanbeintroducedi ﹒ coliby：a）conjugation b）transduction c）transformation d） ......