Ribosomes in the cytoplasm of a bacterium are of which type?
Correct answer: A. 70S
- A. 70S
- B. 80S
- C. 90S
- D. 60S
Explanation
Prokaryotic ribosomes are 70S, made of a 50S and a 30S subunit, while eukaryotic cytoplasmic ribosomes are 80S. Antibiotics such as streptomycin and tetracycline bind the 70S ribosome and leave the host's 80S ribosomes alone, which is why they kill bacteria without killing the patient. Mitochondria and chloroplasts also contain 70S ribosomes, evidence for the endosymbiotic theory.
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About Prokaryotic and Eukaryotic Cells
Prokaryotic cells lack a membrane-bound nucleus and complex membrane-bound organelles, whereas eukaryotic cells contain a nucleus, specialized organelles and a cytoskeleton. Comparisons include DNA organization, ribosomes, cell walls, size, division and examples such as bacteria, archaea, protists, fungi, plants and animals.
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