Multiple Choice
Which class of cell surface receptor is characterized by having seven transmembrane domains and is commonly involved in signal transduction via G proteins?
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14. Cell Signaling
Overview of Cell Surface Receptors
Multiple Choice
Which of the following best explains the advantage that cell surface receptor projections provide to the cell?
A
They provide structural support to the cell membrane, preventing it from collapsing.
B
They enable the cell to store more genetic material.
C
They increase the surface area available for ligand binding, enhancing the cell's ability to detect external signals.
D
They allow the cell to move more rapidly through its environment.
Verified step by step guidance1
Understand the role of cell surface receptors: Cell surface receptors are proteins embedded in the plasma membrane that detect and respond to external signals, such as hormones, neurotransmitters, or other signaling molecules (ligands).
Recognize the importance of surface area: The projections on the cell surface, such as microvilli or other receptor-rich structures, increase the surface area of the cell membrane. This allows for more receptors to be present on the membrane.
Relate surface area to ligand binding: With an increased surface area, the cell can accommodate more receptors, which enhances its ability to bind to ligands and detect external signals more effectively.
Eliminate incorrect options: Structural support to the membrane, storing genetic material, or aiding in cell movement are not functions of receptor projections. These options do not align with the primary role of cell surface receptors.
Conclude the correct explanation: The advantage of cell surface receptor projections is that they increase the surface area available for ligand binding, thereby enhancing the cell's ability to detect and respond to external signals.
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