Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

2. Cell Chemistry & Cell Components

Types of Membrane Proteins

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Types of Membrane Proteins

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Problem 5d

Textbook Question

Mark the following statements about the plasma membrane as true or false. If a statement is false, correct it to make a true statement.
Membrane proteins often function as channels or carriers.

Verified step by step guidance

Understand the role of membrane proteins: Membrane proteins are integral or peripheral proteins embedded in or associated with the plasma membrane. They play various roles, including acting as channels or carriers to facilitate the movement of substances across the membrane.

Evaluate the statement: 'Membrane proteins often function as channels or carriers.' This statement is true because many membrane proteins are specifically designed to transport ions, molecules, or other substances across the plasma membrane.

Clarify the function of channels: Channel proteins form pores or openings in the membrane that allow specific ions or molecules to pass through, typically following their concentration gradient.

Clarify the function of carriers: Carrier proteins bind to specific substances on one side of the membrane, undergo a conformational change, and release the substance on the other side, often facilitating active or passive transport.

Conclude the evaluation: Since the statement is accurate, no correction is needed. Membrane proteins indeed often function as channels or carriers to support cellular transport processes.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Plasma Membrane Structure

The plasma membrane is a phospholipid bilayer that surrounds and protects the cell, providing a barrier between the internal environment and the external surroundings. It is embedded with various proteins that play critical roles in transport, signaling, and maintaining the cell's shape.

Membrane Proteins

Membrane proteins are integral or peripheral proteins that perform essential functions in the plasma membrane. They can act as channels or carriers to facilitate the movement of substances across the membrane, as well as serve as receptors for signaling molecules, contributing to cellular communication.

Transport Mechanisms

Transport mechanisms refer to the processes by which substances move across the plasma membrane. This includes passive transport, such as diffusion and osmosis, and active transport, which requires energy to move molecules against their concentration gradient, ensuring that essential nutrients enter and waste products exit the cell.