Which statement BEST distinguishes prokaryotic from eukaryotic ribosomes?
ABoth are identical in their size and chemical composition
BProkaryotic are 70S (50S + 30S) and eukaryotic are 80S (60S + 40S)
CProkaryotic are membrane bound; eukaryotic remain free in cytosol
DProkaryotic ribosomes contain DNA; eukaryotic ribosomes do not
Answer & Solution
Correct answer: B. Prokaryotic are 70S (50S + 30S) and eukaryotic are 80S (60S + 40S)
Sedimentation coefficients and subunit composition differ. Mitochondrial and chloroplast ribosomes are 70S (consistent with their bacterial endosymbiont origin), while cytoplasmic ribosomes are 80S in eukaryotes.
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