AP Biology Flashcards: Signal Transduction Pathways
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
A toxin mimics a natural signaling molecule, activating a pathway that leads to a harmful cellular response. What does this scenario demonstrate?
This demonstrates how a chemical can interfere with and activate a signaling pathway, leading to an altered and potentially detrimental cellular response.
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A toxin mimics a natural signaling molecule, activating a pathway that leads to a harmful cellular response. What does this scenario demonstrate?
This demonstrates how a chemical can interfere with and activate a signaling pathway, leading to an altered and potentially detrimental cellular response.
What are the three main types of cellular responses that can be triggered by a signal transduction pathway?
A signal transduction pathway can result in changes in gene expression, altered cell function, or programmed cell death (apoptosis).
What is the consequence of a mutation occurring within a signal transduction pathway?
A mutation or change in a signal transduction pathway can alter the cellular response by affecting the function of downstream components in the cascade.
Define apoptosis in the context of signal transduction.
Apoptosis is the process of programmed cell death, which can be initiated as a specific cellular response to a signal transduction pathway.
How does a structural change in a signaling molecule affect the pathway's activity?
A change in the structure of any signaling molecule can alter its ability to interact with other components, thereby affecting the overall activity of the signaling pathway.
In what two ways can chemicals interfere with signal transduction pathways?
Chemicals that interfere with any component of a signaling pathway can either activate the pathway, causing a response, or inhibit it, blocking a response.
A certain drug binds to a receptor protein, preventing the original signal from binding. What is the effect of this chemical interference?
This chemical interferes with a component of the signaling pathway, which can inhibit the pathway and prevent the intended cellular response.
Why is the structure of a signaling molecule critical for pathway function?
The specific structure of a signaling molecule dictates its interaction with other pathway components; any change can affect the pathway's activity.
If a mutation causes a protein in a signaling pathway to become permanently active, how does this affect the cell?
This structural change leads to a continuously active signaling pathway, which can alter cellular responses like gene expression or cell function without an initial signal.
What is meant by an 'altered cell function' as a response to a signal?
This refers to a signal transduction pathway causing a change in the cell's activities, such as opening an ion channel or initiating metabolic processes.