What is a key difference between prokaryotes and eukaryotes?

• A. Prokaryotes contain a nucleus
• B. Eukaryotes lack organelles
• C. Eukaryotes have a nucleus
• D. Prokaryotes are multicellular

Answer: (C)

Eukaryotes are characterized by the presence of a nucleus, which is a membrane-bound organelle that houses the cell's genetic material. This distinction is fundamental when comparing eukaryotes to prokaryotes, which do not have a true nucleus; their genetic material is located in a region called the nucleoid that is not enclosed by a membrane.

In addition to the nucleus, eukaryotes typically possess various organelles, such as mitochondria and endoplasmic reticulum, which perform specialized functions within the cell. This compartmentalization allows for more complex cellular processes. Prokaryotes, on the other hand, lack these membrane-bound organelles, having a simpler structure overall.

Understanding this fundamental difference is crucial in the study of biology, as it influences how these two types of organisms grow, reproduce, and carry out metabolic processes.