Restriction Enzymes — Prelims Questions

Which of the following statements about restriction enzymes is INCORRECT?

A restriction enzyme named 'PstI' was isolated from the bacterium *Providencia stuartii*. According to the nomenclature rules, what does 'I' represent?

Which of the following sequences is a palindromic recognition site for a restriction enzyme?

Which enzyme is responsible for joining the DNA fragments produced by restriction enzymes to form a recombinant DNA molecule?

Which of the following conditions might lead to 'star activity' of a restriction enzyme?

The protection of bacterial host DNA from its own restriction enzymes is achieved by: