객관식
Which of the following statements about the role of phospholipids in the structure and function of biological membranes is correct?
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6. The Membrane
Biological Membranes
객관식
Consider the currently accepted fluid mosaic model of the plasma membrane. Where in the membrane would carbohydrates most likely be found?
A
In the interior of the membrane
B
On the inside (cytoplasmic) surface of the membrane
C
On both hydrophilic surfaces of the membrane but not in the hydrophobic interior
D
Carbohydrates are rarely associated with plasma membranes.
E
On the outside (external) surface of the membrane
검증된 단계별 안내1
Understand the fluid mosaic model: The plasma membrane is composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates. The model describes the membrane as a dynamic and flexible structure.
Identify the location of carbohydrates: In the fluid mosaic model, carbohydrates are typically attached to proteins (forming glycoproteins) or lipids (forming glycolipids) on the extracellular surface of the membrane.
Recognize the function of carbohydrates: Carbohydrates on the plasma membrane play a crucial role in cell recognition, signaling, and adhesion, which are processes that occur on the external surface of the cell.
Consider the hydrophilic and hydrophobic regions: The phospholipid bilayer has hydrophilic (water-attracting) heads facing outward and inward, and hydrophobic (water-repelling) tails facing the interior. Carbohydrates are found on the hydrophilic surfaces, particularly the external surface.
Conclude the location of carbohydrates: Based on their role and attachment to membrane proteins and lipids, carbohydrates are most likely found on the outside (external) surface of the membrane, facilitating interactions with the environment.
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