cau 7 : Viec lua chon tb chu chu yeu fu thuoc vao muc dich thj nghiem tao dong. Neu muc dich la tach ra 1 gen de fan tich thj yeu cau o day chj can 1 hethong don gian , de use . Neu muc dich la bieu hien kieu thong tin di truyen 1 sv EUkaryote chang han o DV, TV thi doi hoi fai co 1 he thong dac thu hon . HAi muc dich nay k nhat  thiet fai loai tru lan nhauthuong thi 1 vat chu ban dau don gian dc su dung de tach 1 doan trinh tu ma doan nay sau do dc dua vao 1 he thong fuc hop de bieu hien  : ca loai tb chu khac nhau thuong use nham muc dich :

- Nuoi so luong lon de tach plasmid cho thj nghiem tao dong.

- Dung de bieu hen gen , Dac biet o eukaryote bac cao nhu DV,TV

- Dung de SX cac pr tai to hop