CAIE A Level Biology 9700 · The mitotic cell cycle
During metaphase of mitosis, chromosomes are highly condensed. A chromosome at this stage consists of two sister chromatids joined at a centromere. Each chromatid contains a single linear DNA molecule. Describe the structure of this chromosome, making reference to histone proteins, the centromere, and telomeres.
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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