QuestionAugust 26, 2025

3. List and explain the difference between the two types of membrane transport proteins. 4. Describe the process of endocytosis.

3. List and explain the difference between the two types of membrane transport proteins. 4. Describe the process of endocytosis.
3. List and explain the difference between the two types of membrane transport proteins. 4. Describe the process of endocytosis.

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Answer

Channel Proteins allow passive transport; Carrier Proteins can perform both passive and active transport. Endocytosis involves engulfing material into vesicles via phagocytosis, pinocytosis, or receptor-mediated methods. Explanation 1. Types of Membrane Transport Proteins There are two main types: **Channel Proteins** and **Carrier Proteins**. Channel proteins form pores allowing specific molecules to pass through by diffusion, while carrier proteins bind to molecules and change shape to shuttle them across the membrane. 2. Difference Between Channel and Carrier Proteins **Channel Proteins** facilitate passive transport without energy, allowing ions or water to move down their concentration gradient. **Carrier Proteins** can perform both passive and active transport, requiring energy for active transport to move substances against their concentration gradient. 3. Process of Endocytosis Endocytosis is a cellular process where cells engulf external material by wrapping the cell membrane around it, forming a vesicle. This includes **phagocytosis** (engulfing large particles), **pinocytosis** (ingesting fluids), and **receptor-mediated endocytosis** (specific uptake using receptors).

Explanation

1. Types of Membrane Transport Proteins<br /> There are two main types: **Channel Proteins** and **Carrier Proteins**. Channel proteins form pores allowing specific molecules to pass through by diffusion, while carrier proteins bind to molecules and change shape to shuttle them across the membrane.<br /><br />2. Difference Between Channel and Carrier Proteins<br /> **Channel Proteins** facilitate passive transport without energy, allowing ions or water to move down their concentration gradient. **Carrier Proteins** can perform both passive and active transport, requiring energy for active transport to move substances against their concentration gradient.<br /><br />3. Process of Endocytosis<br /> Endocytosis is a cellular process where cells engulf external material by wrapping the cell membrane around it, forming a vesicle. This includes **phagocytosis** (engulfing large particles), **pinocytosis** (ingesting fluids), and **receptor-mediated endocytosis** (specific uptake using receptors).
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