Multiple Choice
Which of the following best describes the action of an endocrine disruptor?
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10. Cell Signaling
Introduction to Cell Signaling
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In a signal transduction pathway, what is the primary role of a transcription factor?
A
It degrades signaling molecules to terminate the pathway.
B
It acts as a membrane receptor to detect extracellular signals.
C
It binds to specific DNA sequences to regulate gene expression.
D
It phosphorylates target proteins to propagate the signal.
Verified step by step guidance1
Understand the concept of signal transduction pathways: These are processes by which a cell converts an extracellular signal into a functional response, often involving a series of molecular events.
Recognize the role of transcription factors: Transcription factors are proteins that bind to specific DNA sequences to regulate the transcription of genes, which is the process of converting DNA into RNA.
Clarify why transcription factors are important in signal transduction: They act as the final step in many pathways, where the signal leads to changes in gene expression, allowing the cell to respond appropriately to the signal.
Differentiate transcription factors from other components in the pathway: For example, membrane receptors detect extracellular signals, kinases phosphorylate proteins to propagate signals, and other mechanisms may terminate the pathway.
Conclude that the primary role of a transcription factor in a signal transduction pathway is to bind to specific DNA sequences and regulate gene expression, enabling the cell to produce proteins or other molecules in response to the signal.
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