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CAIE A Level Biology 9700 · Cell structure

Cell structure: describe question

Describe4 marksStandard

A scientist isolates a small, unicellular organism from a geothermal hot spring. It has the following characteristics:

  • Diameter approximately 2 μm.
  • Surrounded by a cell wall containing peptidoglycan.
  • Contains a single circular chromosome of DNA.
  • Possesses 70S ribosomes.
  • No double-membrane-bound organelles are present.
  • It can grow and divide independently.

Describe the features of this organism that allow you to classify it as either a virus, a prokaryote, or a eukaryote. Use the features listed to justify your answer.

0 words · 4 marks

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

How this question is marked

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.

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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