QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
"The concept of a membrane as a fluid mosaic reflects the ability of ______.
A. most proteins but not phospholipids to drift about in the plane of the membrane
B. carbohydrates to drift into and out of the membrane structure
C. phospholipids but not proteins to drift about in the plane of the membrane
D. phospholipids and most proteins to drift about in the plane of the membrane"
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Answer
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Step 1: Identify the correct answer based on the concept of a membrane as a fluid mosaic.
The fluid mosaic model describes the membrane as a fluid-like structure with proteins and phospholipids floating in it. The proteins and phospholipids can move laterally in the plane of the membrane. Therefore, the correct answer is: D. phospholipids and most proteins to drift about in the plane of the membrane
Step 2: Explain the reasoning behind the answer.
The fluid mosaic model describes the plasma membrane as a two-layered (bilayer) structure composed mainly of phospholipids, cholesterols, and proteins. The hydrophilic (water-loving) heads of the phospholipids face outwards, while the hydrophobic (water-fearing) tails face inwards, creating a permeable barrier. The proteins are embedded in this lipid bilayer and can be peripheral (attached to the surface) or integral (spanning the membrane). The fluidity of the membrane allows most proteins and phospholipids to move laterally in the plane of the membrane, facilitating various cellular processes such as cell recognition, signaling, and transport.
Final Answer
The fluid mosaic model describes the plasma membrane as a two-layered (bilayer) structure composed mainly of phospholipids, cholesterols, and proteins. The hydrophilic (water-loving) heads of the phospholipids face outwards, while the hydrophobic (water-fearing) tails face inwards, creating a permeable barrier. The proteins are embedded in this lipid bilayer and can be peripheral (attached to the surface) or integral (spanning the membrane). The fluidity of the membrane allows most proteins and phospholipids to move laterally in the plane of the membrane, facilitating various cellular processes such as cell recognition, signaling, and transport.
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