Which statement about eukaryotes is true?

• A. Eukaryotes have a nucleus and are usually multicellular.
• B. Eukaryotes lack a nucleus.
• C. Eukaryotes have no membrane-bound organelles.
• D. Eukaryotes reproduce only by spores.

Answer: (A)

Think about what sets eukaryotes apart: they have a true nucleus enclosed by a membrane and internal compartments formed by membrane-bound organelles like mitochondria and the Golgi apparatus. This organization enables complex cellular functions and supports multicellular life in many lineages, such as animals, plants, and fungi. That combination—nucleus plus membrane-bound organelles and the tendency toward multicellularity—is why this statement is true. It wouldn’t be true that eukaryotes lack a nucleus or lack membrane-bound organelles, since those features define them and distinguish them from prokaryotes. And while some eukaryotes can reproduce by spores, many do not rely solely on spores, so “reproduce only by spores” isn’t universally accurate.