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

The correct answers are as follows:

1. The following fall under the definition of exocytosis:

a. Increases the surface area of the plasma membrane

b. Secretes large molecules out of the cell

c. Requires fusion of vesicles with the plasma membrane.

2. The following fall under the definition of endocytosis:

a. Decreases the surface area of the plasma membrane

b. Form vesicles from inward folding of the plasma membrane.

3. The following are found in both exocytosis and endocytosis:

a. Requires cellular energy.

b. Transported substances never physically cross the plasma membrane