<prompt> Arrange the steps in apoptosis in sequence of occurrence: 1. Release of cyt c in cytoplasm2. Activation of APAF-13. Removal of BCL-2 4. Caspase activation3-1-2-44-2-1-31-2-4-33-2-4-1  <response>: Intrinsic Pathway of Apoptosis:- Apoptosis causes fragmentation of DNA, which gives Step-Ladder pattern on DNA gel electrophoresis. 