What effect would mutational damage of the following genes or gene regions have on the induction of an integrated lambda phage virus? a. damage to the cI gene b. damage to the cro gene c. damage to the xis gene
What will be an ideal response?
(a) The cI gene encodes the lambda repressor, elimination of which permits transcription from the PL and PR promoters, leading to the lytic pathway.
(b) Eliminating the Cro protein also permits transcription from the PL and PR promoters.
(c) Damage to the enzyme excisionase would circumvent induction because this enzyme is necessary for excision from the bacterial chromosome.
You might also like to view...
Which of the following animals do NOT have
tissues?
a. sponges b. annelids c. roundworms d. cnidarians e. more than one of these animals does not have tissues
A true predator is a species that
A) feeds upon any part of any organism, not necessarily killing it. B) feeds only on animals. C) kills its prey more or less immediately upon capture. D) feeds on dead or living prey.
The two domains of prokaryotes are Bacteria and Fungi
__________________ Indicate whether the statement is true or false.
Which hormone plays an "anti-abscission role" in plants?
A) auxin B) ethylene C) gibberellin D) cytokinin