Q10 · 2021 · Paper 2Unclassified3 marks
QUESTION 10 (3 marks)
Describe three ways DNA occurs in cells.
WORKED SOLUTION
3 marksQCAA guide · typeset solution
QCAA sample response and mark allocation
10 | In eukaryotes, DNA occurs bound to histone proteins in chromosomes in the nucleus of eukaryotes or as unbound circular DNA in the mitochondria. It can also occur as unbound circular DNA in the cytosol of prokaryotic cells. | • describes one way DNA occurs in cells [1 mark] • describes a second way DNA occurs in cells [1 mark] • describes a third way DNA occurs in cells [1 mark] |
QCAA sample response and marking criteria reproduced from the official guide.
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