Endocytosis moves materials _____ a cell via _____.

• A. out of; active transport pumps
• B. into; vesicle formation
• C. into; protein channels
• D. out of; vesicle fusion

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the concept of endocytosis. Endocytosis is a cellular process where materials are brought into the cell by engulfing them in a vesicle formed from the plasma membrane.
2. Step 2: Compare endocytosis with exocytosis. Exocytosis is the opposite process, where materials are moved out of the cell via vesicle fusion with the plasma membrane.
3. Step 3: Analyze the options provided. The correct mechanism for endocytosis involves vesicle formation, which is a key feature of this process.
4. Step 4: Eliminate incorrect options. For example, 'out of; active transport pumps' and 'out of; vesicle fusion' describe processes that move materials out of the cell, not into it. Similarly, 'into; protein channels' does not describe vesicle formation, which is specific to endocytosis.
5. Step 5: Conclude that the correct answer is 'into; vesicle formation,' as this accurately describes the process of endocytosis.