Which statement best describes eukaryotic cells?

• A. They lack organelles.
• B. They have membrane-bound organelles and multiple chromosomes in nucleus.
• C. They are always multicellular.
• D. They have a single circular chromosome.

Answer: (B)

Eukaryotic cells are characterized by compartmentalization: they contain membrane-bound organelles and a nucleus where their genetic material is organized into multiple linear chromosomes. This setup, with a nucleus enclosed by a nuclear envelope and internal compartments like mitochondria and endoplasmic reticulum, distinguishes them from prokaryotic cells, which lack a true nucleus and usually carry a single circular chromosome in the cytoplasm. While many eukaryotes form multicellular organisms, some are unicellular, so being multicellular isn’t universal. The statement about lacking organelles isn’t correct, since membrane-bound organelles are a defining feature of eukaryotic cells.