Question:
Which of the following structure is commonly found in both prokaryotes and eukaryotes?
Which of the following structure is commonly found in both prokaryotes and eukaryotes?
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Ribosomes are the only non-membrane-bound structures involved in translation that are found in all three domains of life: Archaea, Bacteria, and Eukarya.
This universal conservation highlights their ancient evolutionary origin.
This universal conservation highlights their ancient evolutionary origin.
Updated On: Jul 23, 2026
- Centrosome
- Ribosomes
- Vacuoles
- Mesosomes
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Cellular life is fundamentally divided into prokaryotic and eukaryotic organisms based on structural complexity.
Prokaryotes lack membrane-bound organelles and a defined nucleus, whereas eukaryotes contain compartmentalized membrane-bound structures.
The identification of cellular structures shared across both domains is essential for understanding the universal machinery of life.
Step 2: Detailed Explanation:
Let us examine each of the listed structures individually to determine their cellular distribution.
Centrosomes are microtubule-organizing centers that play a major role in animal cell division, and they are absent in prokaryotes.
Vacuoles are large membrane-bound sacs used for storage and osmoregulation, found primarily in eukaryotic cells such as plants and fungi.
Mesosomes are specialized invaginations of the plasma membrane in some prokaryotes, which were historically linked to respiration and cell wall synthesis, but are absent in eukaryotes.
Ribosomes are non-membrane-bound ribonucleoprotein complexes responsible for protein translation in all living cells.
Although prokaryotes have 70S ribosomes and eukaryotes have 80S ribosomes (in addition to organellar 70S ribosomes), the basic structural and functional framework of ribosomes is universally conserved across both domains.
Step 3: Final Answer:
Ribosomes are the universal structures found in both prokaryotes and eukaryotes.
This corresponds to Option (B).
Cellular life is fundamentally divided into prokaryotic and eukaryotic organisms based on structural complexity.
Prokaryotes lack membrane-bound organelles and a defined nucleus, whereas eukaryotes contain compartmentalized membrane-bound structures.
The identification of cellular structures shared across both domains is essential for understanding the universal machinery of life.
Step 2: Detailed Explanation:
Let us examine each of the listed structures individually to determine their cellular distribution.
Centrosomes are microtubule-organizing centers that play a major role in animal cell division, and they are absent in prokaryotes.
Vacuoles are large membrane-bound sacs used for storage and osmoregulation, found primarily in eukaryotic cells such as plants and fungi.
Mesosomes are specialized invaginations of the plasma membrane in some prokaryotes, which were historically linked to respiration and cell wall synthesis, but are absent in eukaryotes.
Ribosomes are non-membrane-bound ribonucleoprotein complexes responsible for protein translation in all living cells.
Although prokaryotes have 70S ribosomes and eukaryotes have 80S ribosomes (in addition to organellar 70S ribosomes), the basic structural and functional framework of ribosomes is universally conserved across both domains.
Step 3: Final Answer:
Ribosomes are the universal structures found in both prokaryotes and eukaryotes.
This corresponds to Option (B).
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