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.

Question

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.

Quizplus · Accepted Answer

Caveolae, a type of pinocytic vesicles, contain caveolins and cavins as their structural proteins, and constitute the main route of entry for several pathogens. Other pathogens may enter the cell by macropinocytosis which involves the formation of ruffles. Professional phagocytes in our body engulf foreign cells and particles by phagocytosis.

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