Which cellular process removes substances from the cell by transporting them in a vesicle that fuses with the plasma membrane?

• A. Endocytosis
• B. Exocytosis
• C. Phagocytosis
• D. Facilitated diffusion

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the key terms related to cellular transport processes. Endocytosis is the process by which cells take in substances by engulfing them in a vesicle formed from the plasma membrane.
2. Step 2: Recognize that exocytosis is the process where substances contained in vesicles inside the cell are transported to the plasma membrane, and the vesicle fuses with the membrane to release the contents outside the cell.
3. Step 3: Differentiate phagocytosis, which is a type of endocytosis specifically for engulfing large particles or cells, from exocytosis, which is about exporting substances out of the cell.
4. Step 4: Note that facilitated diffusion is a passive transport mechanism that moves substances across the membrane via protein channels or carriers, without vesicle involvement.
5. Step 5: Conclude that the process described—removing substances from the cell by vesicle transport and fusion with the plasma membrane—is exocytosis.