Indicate Whether Each of the Following Descriptions Better Applies to Receptor-Mediated

Short Answer

Indicate whether each of the following descriptions better applies to receptor-mediated endocytosis (R), phagocytosis (F), pinocytosis (P), or macropinocytosis (M). Your answer would be a four-letter string composed of letters R, F, P, and M only, e.g. MMPF.
( ) This pathway depends on caveolin and cavin proteins.
( ) Pathogenic particles such as SV40, papillomavirus, and cholera toxin enter the cell via this pathway.
( ) In animals, this pathway is normally limited to professional cells such as neutrophils.
( ) This pathway proceeds by the formation of highly ruffled regions in the plasma membrane which then collapse, resulting in fluid uptake.