Which of the following statements about apoptosis is true?

• A. Apoptosis typically involves only a single signaling pathway.
• B. Apoptosis occurs randomly during embryonic development of a nematode.
• C. Apoptosis is triggered only by signals from outside the cell.
• D. All of the listed responses are correct.
• E. Apoptosis is essential for normal development of the nervous system.

Answer: (E)

Verified step by step guidance

1. Understand the concept of apoptosis: Apoptosis is a form of programmed cell death that is crucial for the development and maintenance of healthy tissues.
2. Recognize that apoptosis is not limited to a single signaling pathway. It involves multiple pathways, including intrinsic and extrinsic pathways, which can be triggered by various signals.
3. Consider the role of apoptosis in development: During embryonic development, apoptosis is a highly regulated process that helps shape organs and tissues, including the nervous system.
4. Identify that apoptosis can be triggered by both internal and external signals, such as DNA damage or signals from other cells.
5. Conclude that the statement 'Apoptosis is essential for normal development of the nervous system' is true, as apoptosis helps eliminate unnecessary or damaged cells, allowing for proper development and function.