Question

Promoters are generally used after isolation from ___________

(a) bacteriophage T7

(b) bacteriophage SP6

(c) baceriophage Mu

(d) both bacteriophage T7 and SP6

This question was posed to me by my college director while I was bunking the class.

This intriguing question comes from Synthesis of RNA in portion Use of Cloned DNA of Genetic Engineering

Answer 1

Right answer is (d) both bacteriophage T7 and SP6

Explanation: Promoters used for the synthesis of RNA are generally obtained from bacteriophage T7 and SP6. They can also be obtained rarely from bacteriophage T3.