1. What is the most important message delivered by this paper?
ced-1 is important for removing cells with surface exposed PS in C. elegans
psr-1 is important for removing cells with surface exposed PS in C. elegans
tat-1 is important for maintaining PS asymmetry on plasma membrane
tat-1 is important for removing cells with surface exposed PS in C. elegans
All of the above

2. tat-1 is a gene that is important for killing the cells
that is important for cell corpse engulfment
that is important for removing cells with surface exposed PS
that is important for keeping PS in the inner leaflet of plasma membrane
None of the above

3. PS is a signal that can induce phagocytosis
The fact that live cells with surface exposed PS are randomly engulfed at a low percentage suggests
PS is a signal that can induce phagocytosis
PS is a signal for apoptotic cells
PS is an efficient signal for cell corpse engulfment
PS is an efficient signal for cell killing
All of the above

4. Loss of ced-1 can block missing cell phenotype of tat-1(lf) animals, because
A ced-1 promotes cell death B ced-1 is important for recognizing surface-exposed PS and phagocytosis of PS-exposed cells C ced-1 is important for PS externalization in tat-1(lf) animals D ced-1 is important for cell corpses engulfment E All of the above

5. The fact that loss of ced-1 or psr-1 can block missing cell phenotype of tat-1(lf) animals suggests
A ced-1 and psr-1 act in the same pathway to promote phagocytosis B ced-1 depends on psr-1 to remove living cells with surface-exposed PS C psr-1 depends on ced-1 to remove living cells with surface-exposed PS D ced-1 is important for clearance of apoptotic cells E None of the above