Which statement describes developmentally programmed cell death?

• A. Some cells die randomly during development
• B. Certain cells are programmed to die at appropriate times
• C. All cells survive during development
• D. Death occurs only due to toxins

Answer: (B)

Programmed cell death during development, apoptosis, is a tightly regulated process that removes specific cells at precise times to shape tissues and organs. The best description is that certain cells are pre-programmed to die at appropriate times, driven by genetic and signaling programs. This controlled elimination ensures proper morphogenesis, such as removing transient structures and refining neural connections. It isn’t random, it isn’t universal survival, and it isn’t caused by toxins. Cells die in an orderly way, with specific signaling leading to caspase activation, orderly dismantling, and cleanup by phagocytes, all without causing inflammation.