Compartmentalization is crucial for cell signaling as it allows specific signaling pathways to be isolated and regulated within distinct cellular areas. It also contributes to cell survival by preventing inappropriate activation of apoptotic programs through physical separation of signaling molecules. Additionally, signals such as stress or damage can trigger the release or activation of pro-apoptotic proteins that are typically kept inactive.

1. Compartmentalization is a major determinant of physiological processes in cells.
A. Describe one way in which "compartmentalization" contributes to cell signaling.
B. Provide one way in which compartmentalization contributes to cell survival by protecting cells
from inappropriate activation of apoptotic programs.
C. Describe one signal that triggers "release" or "activation" of a pro-apoptotic protein that is
normally maintained in an inactive form (or sequestered from its target).