CAIE A Level Biology 9700 · Nucleic acids and protein synthesis

Nucleic acids and protein synthesis: explain question

Explain4 marksStandard

The table below shows a short sequence from a eukaryotic gene. The top strand is the non-template strand.

Strand	Sequence (5' to 3')
Non-template	ATG GCT CGA TAA
Template	TAC CGA GCT ATT

Note: The sequence shown is part of a single exon.

Explain how the information in this DNA sequence is used to produce a polypeptide. In your answer, refer to:

the template strand and RNA polymerase
mRNA splicing
codons, tRNA anticodons, and the genetic code
the roles of ribosomes and start/stop codons

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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.

Nucleic acids and protein synthesis: explain question

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