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The cell membrane primarily consists of a collection of individual lipid molecules. Of the following three images, which one shows the correct orientation of these lipid molecules to form the cell membrane?

The cell membrane primarily consists of a collection of individual lipid molecules. Of the following three images, which one shows the correct orientation of these lipid molecules to form the cell membrane?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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The cell membrane primarily consists of a collection of individual lipid molecules. Of the following three images, which one shows the correct orientation of these lipid molecules to form the cell membrane?
 
### Diagram Explanation: The image contains three diagrams labeled A, B, and C, each illustrating a different arrangement of lipid bilayers, commonly found in cellular membranes. #### Diagram A: - **Description**: This diagram shows a classic lipid bilayer structure with two layers of lipids. Each lipid molecule has a spherical "head" region and two "tail" regions. The head groups face outward, while the tails face inward, creating two opposing layers. - **Significance**: This arrangement is typical of biological membranes, where the hydrophilic (water-attracting) heads face the external and internal aqueous environments, and the hydrophobic (water-repelling) tails are sandwiched inside, away from water. #### Diagram B: - **Description**: This diagram depicts a single layer of lipids, with the heads facing outward and tails directed towards the center. - **Significance**: A single lipid layer is often found in micelles, which are spherical structures that help in the absorption of fats and fat-soluble vitamins in the intestine. #### Diagram C: - **Description**: This diagram illustrates a lipid bilayer similar to Diagram A but shows a more condensed arrangement with a tight stacking of lipid molecules. - **Significance**: This could represent areas of a membrane with higher density, such as lipid rafts, which are involved in signaling and protein sorting due to their more ordered state. Each diagram offers insights into the dynamic structures and functions of cell membranes and their role in maintaining cellular integrity and facilitating biological processes.
Transcribed Image Text:### Diagram Explanation: The image contains three diagrams labeled A, B, and C, each illustrating a different arrangement of lipid bilayers, commonly found in cellular membranes. #### Diagram A: - **Description**: This diagram shows a classic lipid bilayer structure with two layers of lipids. Each lipid molecule has a spherical "head" region and two "tail" regions. The head groups face outward, while the tails face inward, creating two opposing layers. - **Significance**: This arrangement is typical of biological membranes, where the hydrophilic (water-attracting) heads face the external and internal aqueous environments, and the hydrophobic (water-repelling) tails are sandwiched inside, away from water. #### Diagram B: - **Description**: This diagram depicts a single layer of lipids, with the heads facing outward and tails directed towards the center. - **Significance**: A single lipid layer is often found in micelles, which are spherical structures that help in the absorption of fats and fat-soluble vitamins in the intestine. #### Diagram C: - **Description**: This diagram illustrates a lipid bilayer similar to Diagram A but shows a more condensed arrangement with a tight stacking of lipid molecules. - **Significance**: This could represent areas of a membrane with higher density, such as lipid rafts, which are involved in signaling and protein sorting due to their more ordered state. Each diagram offers insights into the dynamic structures and functions of cell membranes and their role in maintaining cellular integrity and facilitating biological processes.
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