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

Biological Membranes

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Biological Membranes

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Multiple Choice

The outer membrane of a gram-negative cell contains which of the following?

Teichoic acids

Cholesterol

Peptidoglycan

Lipopolysaccharides

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Verified step by step guidance

Understand the structure of gram-negative bacteria: Gram-negative bacteria have a unique cell wall structure that includes an outer membrane, a thin layer of peptidoglycan, and an inner cytoplasmic membrane.

Identify the components of the outer membrane: The outer membrane of gram-negative bacteria is distinct from the inner membrane and contains lipopolysaccharides (LPS), which are large molecules consisting of a lipid and a polysaccharide joined by a covalent bond.

Differentiate between gram-positive and gram-negative bacteria: Gram-positive bacteria have a thick peptidoglycan layer and teichoic acids, but lack an outer membrane. Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane containing lipopolysaccharides.

Recognize the absence of cholesterol and teichoic acids: Cholesterol is typically found in eukaryotic cell membranes, not bacterial membranes. Teichoic acids are found in gram-positive bacteria, not in the outer membrane of gram-negative bacteria.

Conclude that lipopolysaccharides are the correct component of the outer membrane of gram-negative bacteria, providing structural integrity and protection.