Comparing Endocytosis and Exocytosis

Steps:

• Count the statements: Three bullet points describe the processes.
• Verify statement 1: Both use vesicles or vacuoles to move materials across the plasma membrane.
• Verify statement 2: Endocytosis engulfs materials into the cell; exocytosis expels them outward.
• Verify statement 3: Endocytosis internalizes membrane, reducing surface area; exocytosis fuses vesicles, adding membrane area.

Why C is correct:

• Cell biology defines endocytosis as inward vesicle transport and exocytosis as outward, with all three statements matching these mechanisms.

Why the others are wrong:

• A: Understates the count; all three are accurate.
• B: Misses the third correct statement on membrane changes.
• D: Overstates; only three statements exist.

Final answer: C