Question

________ is the biological process by which portions of the plasma membrane tuck inward and pinch off to form vesicles that carry material captured from an external medium into the cell.

Group of answer choices

Exocytosis

Photosynthesis

Endocytosis

Endosymbiosis

None of the above

Answer 1

Endocytosis is the biological process by which portions of the plasma membrane tuck inward and pinch off to form vesicles that carry material captured from an external medium into the cell.

Endo means internal (inside) and cytosis means transport mechanism. This endocytosis helps in continuous exchange of material between endoplasmic reticulum, Golgi complex, lysosomes etc using transport vesicles that pinch off the membrane of one organelle that fuse with another in the form of tiny soap bubbles that rejoin and form large bubbles towards inside.

Endocytosis occurs in three forms :

a) Phagocytosis - cell eating

b) Pinocytosis - cell drinking

c) Receptor mediated endocytosis