Endocytosis is a type of ___ transport that ____ materials.

• A. passive; brings in
• B. active; brings in
• C. passive; removes
• D. active; removes

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the concept of endocytosis. Endocytosis is a cellular process where the cell membrane engulfs external materials to bring them into the cell. This process requires energy, making it a type of active transport.
2. Step 2: Differentiate between active and passive transport. Active transport requires energy (usually in the form of ATP) to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.
3. Step 3: Analyze the options provided in the problem. The correct answer must align with the definition of endocytosis as an energy-requiring process that brings materials into the cell.
4. Step 4: Eliminate incorrect options. 'Passive; brings in' is incorrect because endocytosis is not passive. 'Passive; removes' is also incorrect because endocytosis does not remove materials. 'Active; removes' is incorrect because endocytosis brings materials into the cell, not removes them.
5. Step 5: Select the correct answer based on the analysis. The correct answer is 'active; brings in,' as it accurately describes endocytosis as an active transport process that brings materials into the cell.