Question

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

Explanation:

• Centrioles (\(A\)): Present only in animal (eukaryotic) cells.
• Mitochondria (\(B\)): Found in eukaryotic cells (e.g., animal and plant cells) but not in prokaryotic cells.
• Nucleus (\(C\)): A defining feature of eukaryotic cells; prokaryotic cells lack a true nucleus.
• Ribosomes (\(D\)): Both prokaryotic and eukaryotic cells need to synthesize proteins. Ribosomes are the sites of protein synthesis. Prokaryotic cells have 70S ribosomes and eukaryotic cells have 80S ribosomes (with some organelles like mitochondria having 70S - but overall, ribosomes are present in both cell types).

Answer:

D. ribosomes