A-LevelBiologyCell structure9700/12 · May/June 2019 · Q31 Mark
Two different types of cell, P and Q, were broken up using ultrasound and their contents analysed. Both types of cell contained small circular DNA. The circular DNA from P all carried the same base sequence, but those from Q were of two types, with different base sequences. What may be concluded about the identity of cell types P and Q?
AP: heart muscle fibres, Q: root cortical cells
BP: lymphocytes, Q: mature red blood cells contaminated by bacteria
CP: mature red blood cells, Q: phloem sieve tube element
DP: root cortical cells, Q: leaf mesophyll cells
✓ Correct answer
D: P: root cortical cells, Q: leaf mesophyll cells
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