What concept explains the structure or function of cell membranes?

What concept explains the structure or function of cell membranes?

• A. Fluid Mosaic Model
• B. Cell Theory
• C. Endosymbiotic Theory
• D. Mitochondrial Hypothesis

Answer: (A)

The Fluid Mosaic Model is the concept that accurately describes the structure and function of cell membranes. According to this model, cell membranes are not rigid structures but rather are dynamic and flexible, resembling a fluid due to the movement of lipids and proteins within the membrane. The term "mosaic" refers to the diverse array of proteins that are embedded in or attached to the phospholipid bilayer, which float in the fluid lipid environment. This model emphasizes that the lipid bilayer acts as a barrier to most water-soluble substances, while the embedded proteins serve various functions including transport, signaling, and structural support. The ability of these components to move laterally within the membrane also allows for the membrane to adapt and change shape, which is crucial for processes such as endocytosis and exocytosis. In contrast, the other concepts mentioned do not pertain to cell membrane structure or function. Cell Theory primarily describes the fundamental unit of life as the cell and its reproduction. Endosymbiotic Theory explains the origin of eukaryotic cells from prokaryotic organisms through symbiosis. The Mitochondrial Hypothesis focuses on the specific role of mitochondria within eukaryotic cells. Therefore, the Fluid Mosaic Model is the

The Fluid Mosaic Model is the concept that accurately describes the structure and function of cell membranes. According to this model, cell membranes are not rigid structures but rather are dynamic and flexible, resembling a fluid due to the movement of lipids and proteins within the membrane. The term "mosaic" refers to the diverse array of proteins that are embedded in or attached to the phospholipid bilayer, which float in the fluid lipid environment.

This model emphasizes that the lipid bilayer acts as a barrier to most water-soluble substances, while the embedded proteins serve various functions including transport, signaling, and structural support. The ability of these components to move laterally within the membrane also allows for the membrane to adapt and change shape, which is crucial for processes such as endocytosis and exocytosis.

In contrast, the other concepts mentioned do not pertain to cell membrane structure or function. Cell Theory primarily describes the fundamental unit of life as the cell and its reproduction. Endosymbiotic Theory explains the origin of eukaryotic cells from prokaryotic organisms through symbiosis. The Mitochondrial Hypothesis focuses on the specific role of mitochondria within eukaryotic cells. Therefore, the Fluid Mosaic Model is the