IB Biology HL A2.3 Viruses questions

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Question 1

Paper 2Medium4 marks

A 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.

02040608001234567Time after start of monitoring / minConcentration / 106 mL-1● Intact bacterial cells□ Free lambda particles
(a)

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.

[2]
(b)

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.

[2]

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