CAIE A Level Biology 9700 · Genetic technology
A researcher wants to compare which genes are expressed in two types of human cell: normal liver cells and liver cancer cells. She plans to use a DNA microarray. Describe how a DNA microarray can be used to detect the mRNA molecules present in a sample of cells.
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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