1. CED-1 is a protein that localizes to the plasma membrane
that affects engulfment of dead cells
that acts in engulfing cells
that recognizes apoptotic cells
All of the above

2. What is the evidence for CED-1 acting in engulfing cells?
Genetic mosaic analysis
Double mutant analysis
Its molecular identity as a membrane protein
CED-1::GFP clusters around apoptotic cells
Comparison of the rescuing activity of CED-1 when expressed in dying cells or engulfing cells in the ced-1(lf) mutants

3. CED-1::GFP clustering around apoptotic cells depends on
CED-1 interaction with CED-7
CED-1 interaction with CED-6
CED-1 interaction with CED-2
CED-1 interaction with phospholipids on the surface of apoptotic cells
CED-1 extracellular domain and transmembrane domain.

4. CED-1 intracellular domain is
Dispensable for recognition of apoptotic cells
Important for cell corpse engulfment
Shorter than its extracellular domain
Potential target for phosphorylation
All of the above