SAT 2 BIO Question





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Discus: SAT/ACT Tests and Test Preparation: June 2004 Archive: SAT 2 BIO Question
By Pianolover25 (Pianolover25) on Tuesday, June 22, 2004 - 01:32 pm: Edit

Are phagocytosis and pinocytosis types of active transport?

By Adidasty (Adidasty) on Tuesday, June 22, 2004 - 07:10 pm: Edit

Yes, both are. Phagocytosis is where a large marcromolecule or food particle or even another cell is taken into a cell actively (by invagination of the cells membrane surrounding the particle). Pinocytosis is the same thing but with smaller particles or liquids, but it also requires energy. There is also receptor mediated endocytosis which is a form of pinocytosis except that the partices bind to plasma membrane receptor proteins and THEN the membrane invaginates to capture them. Receptor mediated endocytosis, then, as you can see, is an obviously more selective form of pinocytosis.

-The Biomaster


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