Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 39m
3. Energy & Cell Processes10h 8m
4. Tissues & Histology10h 3m
5. Integumentary System2h 28m
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 System3h 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

21. The Immune System

Antibodies

Anatomy & Physiology

21. The Immune System

Antibodies

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Multiple Choice

An antibody’s variable region:
1.   Varies in amino acid sequence to allow different antibodies to bind different antigens.
2.   Is located in the hinge and stem regions of an antibody.
3.   Is a portion of the light chain of an antibody.
4.   Is a portion of the heavy chain of an antibody.

1 & 2.

1 & 3.

3 & 4.

1, 2, & 3.

1, 3, & 4.

1, 2, 3, & 4.

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Verified step by step guidance

Understand the structure of an antibody: Antibodies are Y-shaped molecules composed of two heavy chains and two light chains. Each chain has a constant region and a variable region.

Identify the role of the variable region: The variable region of an antibody is responsible for binding to specific antigens. This region varies in amino acid sequence to allow different antibodies to recognize different antigens.

Locate the variable region: The variable region is found at the tips of the Y-shaped structure, which includes parts of both the light and heavy chains, not in the hinge or stem regions.

Analyze the options: Option 1 is correct because the variable region varies in amino acid sequence. Option 3 is correct because the variable region is part of the light chain. Option 4 is correct because the variable region is also part of the heavy chain.

Conclude the correct answer: Based on the analysis, the correct answer is 1, 3, & 4, as these options accurately describe the characteristics and location of the variable region in an antibody.