If cell R cannot undergo apoptosis and cell S cannot be engulfed, what might explain this?

If cell R cannot undergo apoptosis and cell S cannot be engulfed, what might explain this?

• A. Cell S has a mutation preventing caspase synthesis
• B. Cell R cannot flip phosphatidylserine
• C. Both statements are true
• D. Cell S can flip phosphatidylserine

Answer: (C)

In this scenario, understanding the roles of apoptosis and the engulfment of cells is crucial. Cell R's inability to undergo apoptosis suggests it may have a malfunction in the apoptotic signaling pathways, while cell S's inability to be engulfed indicates issues with its recognition and uptake by phagocytic cells. If cell S has a mutation preventing caspase synthesis, it directly correlates to the inability of that cell to undergo apoptosis. Caspases are essential enzymes that carry out the death program in cells. If they are not synthesized, the cell cannot initiate its self-destruction. On the other hand, if cell R cannot flip phosphatidylserine, this leads to its failure to present "eat me" signals on its surface. Normally, during apoptosis, phosphatidylserine, a phospholipid normally found on the inner leaflet of the plasma membrane, flips to the outer leaflet, marking the cell for phagocytosis. If cell R cannot flip phosphatidylserine, it would not be recognized and engulfed by phagocytes. Both scenarios highlight crucial elements not functioning correctly – caspase synthesis in cell S affects its apoptotic ability, while surface modifications in cell R impact its clearance by the immune system

In this scenario, understanding the roles of apoptosis and the engulfment of cells is crucial. Cell R's inability to undergo apoptosis suggests it may have a malfunction in the apoptotic signaling pathways, while cell S's inability to be engulfed indicates issues with its recognition and uptake by phagocytic cells.

If cell S has a mutation preventing caspase synthesis, it directly correlates to the inability of that cell to undergo apoptosis. Caspases are essential enzymes that carry out the death program in cells. If they are not synthesized, the cell cannot initiate its self-destruction.

On the other hand, if cell R cannot flip phosphatidylserine, this leads to its failure to present "eat me" signals on its surface. Normally, during apoptosis, phosphatidylserine, a phospholipid normally found on the inner leaflet of the plasma membrane, flips to the outer leaflet, marking the cell for phagocytosis. If cell R cannot flip phosphatidylserine, it would not be recognized and engulfed by phagocytes.

Both scenarios highlight crucial elements not functioning correctly – caspase synthesis in cell S affects its apoptotic ability, while surface modifications in cell R impact its clearance by the immune system