CAIE A Level Biology 9700 · Genetic technology

Genetic technology: describe question

Describe5 marksChallenge

A scientist wishes to transfer a gene coding for a fluorescent protein from a jellyfish into a bacterium so that the bacterium produces the fluorescent protein. The scientist has isolated the coding sequence of the gene but it lacks a promoter. Describe why it is necessary to transfer a promoter along with the gene, and outline the steps taken to construct a recombinant plasmid that contains both a suitable promoter and the gene, using restriction endonucleases, DNA ligase, and plasmids. Also explain how expression of the transferred gene can be confirmed.

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5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.

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