Question 1
Paper 2Medium4 marksA culture of Escherichia coli containing bacteriophage lambda was monitored. At 40 min, the culture conditions were changed. Figure 1 shows the measured concentrations of intact bacterial cells and free lambda particles.
(a)[2]
Using Figure 1, identify the viral cycle most consistent with each interval, 0–40 min and 40–80 min. Support each choice with one feature of the graph.
(b)[2]
Explain how lambda DNA is maintained during the first interval, and state two ways in which the bacterial host supports phage production during the second interval.