Question

Sort the phrases into the appropriate bins depending on whether they describe exocytosis, endocytosis, or both.

a. decreases the surface area of the plasma membrane
b. requires fusion of vesicles with the plasma membrane
c. forms vesicles from inward folding of the plasma membrane
d. transported substances never physically cross the plasma membrane
e. increases the surface area of the plasma membrane
f. requires cellular energy
g. secretes large molecules out of the cell

Answer 1

A) Endocytosis : endocytisis is where materials are enveloped by the cell membrane to be taken in by the cell, this action will decrease the surface area while exocytosis will increase it.

B) Both : both exocytosis and endocytosis will require vesicles to fuse with the membrane.

C) Endocytosis : endocytosis will make the membrane fold inwards.

D) Both : the substances that undergo endo and exo -cytosis never physically cross the cell membrane.

E) Exocytosis : as stated in part A, exocytosis will increase the cell membrane surface area.

F) Both : both are considered active transport, meaning they will require energy in the for of ATP (adenine triphosphate).

G) Exocytosis : is when large molecules, wastes, and the likes are secreted out of the cell. Remember, Exo means out, Endo means in.