複選題7. Which of the following descriptions about Apoptosis are CORRECT? (A) It is a kind of programmed cell death in response to extracellular or intracellular stresses. (B) Cells swell and form apoptotic body at the end of apoptosis. (C) There are external and internal pathways in apoptotic signal transduction, and both activation processes converge to a common protein, caspase 9, to finally induce apoptosis. (D) DNA is cleaved into small fragments with around 180 to 200 bp in size. (E) Both apoptosis and autophagy share most of the regulatory mechanisms.