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Which type of ribosome is found in prokaryotic cells?

Answer and explanation

Correct answer: 70S

Direct answer: B, 70S. Prokaryotic cells contain 70S ribosomes, which are made of a 50S large subunit and a 30S small subunit. The S symbol means Svedberg unit, a measure of sedimentation behaviour; it is not a simple arithmetic mass unit, so 50S plus 30S is described as 70S rather than 80S. A is wrong because 80S ribosomes are typical of the cytoplasm of eukaryotic cells. C and D are individual subunit values associated with ribosomes, not the complete prokaryotic ribosome: 50S is the large subunit and 30S is the small one. Memory cue: prokaryote = 70S; eukaryotic cytoplasm = 80S.

Related tags

RibosomeProkaryotes70SCell StructureProtein SynthesisProkaryotic & Eukaryotic CellsProkaryotic Eukaryotic CellsCell – The Unit Of Life

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