Question

Differentiate between Endocytosis and Exocytosis.

Answer 1

Endocytosis is a process of taking up materials into the cell and exocytosis is the process of giving up materials from the cell.

Complete answer:
Endocytosis:-

It is the process by which cells take up substance from the external environment.
In this a vesicle called endocytic vesicles get formed around the foreign substances.
It occurs due to both phagocytosis and pinocytosis.
In this internal vesicles are formed that are like phagosomes are formed
The best known example is formation of food vacuole in amoeba.
It is not involved in cell wall formation
It involves transportation of macromolecules into the cell.
At the end of this process the vesicle fuses with the membrane bound organelles.

Exocytosis:-

It is the process by which cells give up substance to the external environment.
In this the vesicle that is filled with water gets fused with plasma membrane.
It occurs due to regulated secretory pathways.
The vesicle that is secretory in nature gets formed.
The best known example is the hormone release.
It is involved in cell wall formation.
It is involved in transportation of macromolecules out of the cell.
At the end of this process the vesicle gets connected with the cell membrane.

Note:
Amoeba obtains its food with the help of finger-like projections called pseudopodia . It takes food by forming food vacuole around the food particle. Now the vacuole gets fused with the cell surface . The food gets inside the amoeba. Now the undigested food gets excreted out of the cell. This process is the best given example of endocytosis.