Question

which structure would be found in both eukaryotic and prokaryotic cells?
a. centrioles
b. mitochondria
c. nucleus
d. ribosomes

Explanation:

• Centrioles (\(A\)): Found only in animal (eukaryotic) cells.
• Mitochondria (\(B\)): Present in eukaryotic cells (for energy production), absent in prokaryotes.
• Nucleus (\(C\)): A defining feature of eukaryotes (membrane - bound), prokaryotes have a nucleoid (no membrane).
• Ribosomes (\(D\)): Both prokaryotes and eukaryotes need ribosomes for protein synthesis. Prokaryotes have 70S ribosomes, eukaryotes have 80S ribosomes (but the presence is universal in both cell types for the biological process of translation).

Answer:

D. ribosomes