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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 Heart2h 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

Proteins

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Proteins

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Multiple Choice

The overall three-dimensional shape of a single polypeptide is called its __________.

double helix

primary structure

secondary structure

quaternary structure

tertiary structure

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Verified step by step guidance

Understand the levels of protein structure: Proteins have four levels of structure - primary, secondary, tertiary, and quaternary.

Define primary structure: This is the sequence of amino acids in a polypeptide chain, held together by peptide bonds.

Define secondary structure: This involves local folding of the polypeptide chain into structures such as alpha-helices and beta-sheets, stabilized by hydrogen bonds.

Define tertiary structure: This is the overall three-dimensional shape of a single polypeptide chain, formed by interactions between the side chains (R groups) of the amino acids.

Define quaternary structure: This level of structure occurs when multiple polypeptide chains (subunits) come together to form a functional protein complex.