What is a Defining Feature of a Eukaryotic Cell

Question

What is a defining feature of a eukaryotic cell?  
A) Cell wall surrounding the cell
B) Plasma membrane external to the cell wall
C) Internal membranes surrounding organelles
D) Ribosomes in the cytoplasm
E) Large vacuole for storage

Accepted Answer

Internal membranes surrounding organelles are a defining feature of eukaryotic cells. Prokaryotic cells lack internal membranes surrounding organelles and instead have their genetic material, ribosomes, and other cellular components floating freely in the cytoplasm. The presence of internal membranes in eukaryotic cells allows for compartmentalization and specialization of cellular processes.