A-LevelBiologyNucleic acids and protein synthesis9700/12 · May/June 2015 · Q61 Mark
Ribosomes consist of two subunits, each containing rRNA. An analysis of all the 70S ribosomes from a single cell of the bacterium, Escherichia coli, showed that there were: • 38000 rRNA molecules • 2 main types of rRNA molecule • 19000 copies of each type of rRNA molecule How many 70S ribosomes were there in the E. coli cell?
A9500
B19000
C38000
D76000
✓ Correct answer
B: 19000
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