Which unicellular organism contains two nuclei?

Correct answer: Paramecium. Paramecium has two nuclei: a large macronucleus and a small micronucleus.

Background: The macronucleus controls daily activities, and the micronucleus is used in reproduction.

• Amoeba: Amoeba has one nucleus.
• Euglena: Euglena has one nucleus.
• Bacteria: Bacteria have no true nucleus.

Did you know? Paramecium moves with tiny hair-like cilia.

Memory trick: Para-mecium = a pair of nuclei.