Which type has 70S ribosomes?

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Study for the UCF Biomedical Exit Exam. Access flashcards and multiple-choice questions with detailed hints and explanations. Prepare for success!

Multiple Choice

Which type has 70S ribosomes?

Explanation:
70S ribosomes are the type found in prokaryotic cells, including bacteria and archaea. They are composed of a 50S large subunit and a 30S small subunit. In contrast, eukaryotic cells have cytosolic ribosomes that are larger, 80S, made of 60S and 40S subunits. While mitochondria and chloroplasts inside eukaryotic cells do carry their own 70S ribosomes because of their bacterial ancestry, the prominent cellular ribosome type used for most protein synthesis in the cell is 80S. So, the best match for having 70S ribosomes is prokaryotic cells.

70S ribosomes are the type found in prokaryotic cells, including bacteria and archaea. They are composed of a 50S large subunit and a 30S small subunit. In contrast, eukaryotic cells have cytosolic ribosomes that are larger, 80S, made of 60S and 40S subunits. While mitochondria and chloroplasts inside eukaryotic cells do carry their own 70S ribosomes because of their bacterial ancestry, the prominent cellular ribosome type used for most protein synthesis in the cell is 80S. So, the best match for having 70S ribosomes is prokaryotic cells.

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