Which of the following is both in eukaryotic and

prokaryotic cells?

a. nucleus

b. mitochondrion

c. vacuole

d. ribosomes

The nucleus is the membrane-bound organelle and prokaryotes are devoid of the membrane-bound organelle. Hence it is only present in eukaryotes. So, option a is wrong.

As mitochondria are also a membrane-bound organelle hence absent in prokaryotes. So option b is wrong as well.

They are present in both but they are smaller in prokaryotes and have a negligible role. Option c is wrong as well.

Ribosomes are the only cell organelles that are present in prokaryotic as well as eukaryotic cells, while eukaryotes have larger ribosomes as compared to prokaryotes but they have the same function i.e. protein synthesis. Hence, option d is correct.

Eukaryotes and prokaryotes are majorly differentiated on the basis of membrane bound organelles but ribosomes are present in both and helps in protein synthesis.