The bacteriophage lambda genome can exist in either a linear form (see Figures 15.1 and 15.8) or a circular form. How many fragments will be formed by restriction enzyme digestion with XhoI alone, with XbaI alone, and with both XhoI and XbaI in the linear and circular forms of the lambda genome?

Welcome back. Our next question says, how many fragments are formed when the bacteriophage lambda genome is digested with X H 01 only twice a one fragment. B two fragments, C three fragments or D four fragments. Well, in the lambda geno X H 01 has two sites where it cuts at its recognition site. Since it's a restriction enzyme. Uh the X H 01 site happens to be C T C G A G and X H 01 cuts in between the C and G in the middle there. So there are in the lambda genome, two X H O recognition sites. So therefore it cuts the genome into choice B two fragments. So that's our answer. Choice there. Pretty straightforward. Let's move on to the next video.