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CAIE A Level Biology 9700 · Cell structure

Cell structure: outline question

Outline7 marksChallenge

A researcher isolates ribosomes from three different sources and determines their sedimentation coefficients:

  • Source X: 70S ribosomes
  • Source Y: 80S ribosomes
  • Source Z: 70S ribosomes

Source X is a bacterial culture. Source Y is a sample of human liver cells. Source Z is a purified mitochondrial fraction from yeast cells.

Outline the roles of 80S and 70S ribosomes in different cellular locations. Refer to the sources above in your answer.

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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