What distinguishes prokaryotic cells from eukaryotic cells?

• A. Prokaryotic cells lack a plasma membrane
• B. Prokaryotic cells have a defined nucleus
• C. Prokaryotic cells do not possess membrane-bound organelles
• D. Prokaryotic cells are typically much larger in size

Answer: (C)

Prokaryotic cells are distinguished from eukaryotic cells primarily by the absence of membrane-bound organelles. In prokaryotes, which include bacteria and archaea, cellular processes occur in a simpler manner. They contain ribosomes, but these are not membrane-bound and are smaller than those found in eukaryotic cells. Additionally, prokaryotic cells lack structures such as the endoplasmic reticulum, Golgi apparatus, and mitochondria that are typical in eukaryotic cells.

This fundamental difference plays a crucial role in how these types of cells function and replicate. In contrast, eukaryotic cells have a complex organization, including a defined nucleus that houses their genetic material, as well as various organelles that compartmentalize cellular functions. The size distinction is also notable, as eukaryotic cells are generally larger than prokaryotic cells; however, it's the presence of membrane-bound organelles that is a definitive characteristic of eukaryotic cells. Additionally, both prokaryotic and eukaryotic cells possess a plasma membrane, further demonstrating that prokaryotic cells do have this essential structure.