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CAIE A Level Biology 9700 · Nucleic acids and protein synthesis

Nucleic acids and protein synthesis: outline question

Outline7 marksChallenge

In a eukaryotic organism, a gene contains the following sequence on the template (transcribed) strand of DNA:

Normal gene template: 3'-TAC CGA GGT ACT-5' Mutated gene template: 3'-ATC CGA GGT ACT-5'

Outline the process by which the normal gene is expressed to form a polypeptide. In your answer, include:

  • the roles of RNA polymerase, mRNA, tRNA, anticodons, and ribosomes
  • how the mutation would affect the polypeptide produced.
0 words · 7 marks

No account needed for your first marks. Your answer is used only to mark it.

How this question is marked

7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.

Outline means: Give the main points briefly. Less detail than describe, but every key step has to be there. One short line per step, in order. The marks are for coverage, not depth.

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