CAIE A Level Biology 9700 · Nucleic acids and protein synthesis
In a eukaryotic organism, a gene contains four exons and three introns. The primary transcript of this gene is produced in the nucleus.
Describe how the primary transcript is modified to form mature mRNA and explain why this modification is necessary for the production of a functional polypeptide.
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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