O-LevelBiologyEcology & Environment5090/12 · May/June 2022 · Q401 Mark

Stages in the production of insulin on a commercial scale are listed. 1 bacteria produce human insulin 2 bacteria reproduce 3 human insulin gene extracted 4 human insulin gene inserted into bacterial DNA 5 human insulin produced on a commercial scale What is the correct sequence of events?

A3→4→1→5→2

B4→3→5→2→1

C4→2→5→3→1

D3→4→2→5→1

✓ Correct answer

D: 3→4→2→5→1

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2022 Paper 1 Variant 2, question 40.

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