Multiple Choice
Which of the following best describes a hormone?
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10. Cell Signaling
Introduction to Cell Signaling
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Which of the following is most likely to produce an increase in the frequency of a cellular signaling stimulus?
A
Decreasing the number of cell surface receptors
B
Increasing the concentration of the signaling molecule (ligand)
C
Blocking the release of the signaling molecule
D
Inhibiting the activity of intracellular second messengers
Verified step by step guidance1
Step 1: Understand the concept of cellular signaling. Cellular signaling involves the interaction between signaling molecules (ligands) and cell surface receptors, which triggers a cascade of intracellular events leading to a response.
Step 2: Analyze the role of signaling molecules (ligands). Increasing the concentration of signaling molecules can enhance the likelihood of their binding to receptors, thereby increasing the frequency of the signaling stimulus.
Step 3: Evaluate the impact of decreasing the number of cell surface receptors. Fewer receptors would reduce the ability of the cell to detect and respond to signaling molecules, thus decreasing the signaling stimulus.
Step 4: Consider the effect of blocking the release of signaling molecules. If signaling molecules are not released, they cannot bind to receptors, effectively halting the signaling process.
Step 5: Examine the role of intracellular second messengers. Inhibiting second messengers would disrupt the transmission of the signal within the cell, reducing the overall signaling response.
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