ID #2460

Can a lysosome directly engage in endocytosis? or is endocytosis only carried out by an early endosome?

Actually neither. Endocytosis is the uptake of extracellular material in vesicles formed from the plasma membrane. (The uptake of the signal molecules shown in the Lecture 29 slides is an example of endocytosis). A vesicle made of plasma membrane will surround the foreign material. If the extracellular material needs to be degraded, the endocytic vesicle will fuse with the early endosome and eventually a mature lysosome will form. Endosomes and lysosomes do not directly take up foreign material from outside of a cell. 

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