Which structures are found in both prokaryotes and eukaryotes?

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Study for the IMAT Biology Exam with focused multiple-choice questions. Use hints and explanations to enhance your preparation. Get ready for your exam success!

Multiple Choice

Which structures are found in both prokaryotes and eukaryotes?

Explanation:
Ribosomes are the protein-making machines found in all cells, so they appear in both prokaryotes and eukaryotes. In bacteria and other prokaryotes, ribosomes sit in the cytoplasm (and can be free-floating) and they’re slightly smaller (70S) than the ribosomes in eukaryotic cells (80S), which can be free or attached to the rough endoplasmic reticulum. The nucleus, mitochondria, and chloroplasts, on the other hand, are membrane-bound organelles characteristic of eukaryotic cells and are not present in prokaryotes. So the shared structure that fits both domains is the ribosome.

Ribosomes are the protein-making machines found in all cells, so they appear in both prokaryotes and eukaryotes. In bacteria and other prokaryotes, ribosomes sit in the cytoplasm (and can be free-floating) and they’re slightly smaller (70S) than the ribosomes in eukaryotic cells (80S), which can be free or attached to the rough endoplasmic reticulum. The nucleus, mitochondria, and chloroplasts, on the other hand, are membrane-bound organelles characteristic of eukaryotic cells and are not present in prokaryotes. So the shared structure that fits both domains is the ribosome.

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