Which term best describes embryonic stem cells?

• A. Multireactive
• B. Undifferentiated
• C. Undivided
• D. Multinuclear

Answer: (B)

Embryonic stem cells are undifferentiated, meaning they have not yet specialized into a specific cell type. This undifferentiated state allows them to self-renew and to differentiate into many different lineages, which is what makes them pluripotent. In the lab, preserving their undifferentiated status is key to maintaining their developmental potential. The other terms don’t fit: multireactive isn’t a standard descriptor for stem cells; undivided would imply no cell division, which contradicts their inherent ability to proliferate; multinuclear would mean more than one nucleus per cell, which is not a typical feature of embryonic stem cells.