CAIE A Level Biology 9700 · Nucleic acids and protein synthesis
Strand A: 5'-ATGCGTACGTAGC-3' Strand B: 3'-TACGCATGCATCG-5'
These are the two strands of a short eukaryotic gene. The gene also contains an intron that is removed during post-transcriptional modification.
Explain how the information in this gene is used to produce a polypeptide. In your answer, identify which strand is the template strand and describe the roles of transcription and translation.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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