AP Biology Flashcards: Introduction to Signal Transduction
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: July 2026
Review key ideas with interactive flashcards. This set includes 11 cards to help you master important concepts.
What is a signal transduction pathway?
A signal transduction pathway is a process that connects the reception of a signal with a specific cellular response through a series of molecular events.
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What is a signal transduction pathway?
A signal transduction pathway is a process that connects the reception of a signal with a specific cellular response through a series of molecular events.
List three potential cellular responses that can result from a signal transduction pathway.
Potential cellular responses include cell growth, secretion of molecules, or a change in gene expression.
A signal transduction pathway results in the activation of an enzyme that builds glycogen. What type of cellular response is this?
This is a metabolic response, as it involves the regulation of a cellular process like the synthesis or breakdown of molecules.
What is a common mechanism for protein modification in signal transduction pathways?
Many signal transduction pathways involve protein modifications through phosphorylation cascades, where a series of proteins are sequentially phosphorylated.
What is a signaling cascade?
A signaling cascade is a series of events that relays a signal from a receptor to a cellular target, often amplifying the signal's effect along the way.
What event initiates a signal transduction pathway?
Signaling begins when a ligand, or signaling molecule, binds to a specific receptor protein.
If a ligand binds to a receptor in the cytoplasm, what does this imply about the ligand?
This implies the ligand is likely small and/or hydrophobic, allowing it to pass through the cell membrane to reach the intracellular receptor.
What is the role of the components of a signal transduction pathway?
The components, such as receptors and relay molecules, work together to receive, relay, amplify, and ultimately produce a specific cellular response to a signal.
What are the two primary functions of a signaling cascade?
Signaling cascades relay signals from receptors to their cellular targets and often amplify the original signal.
Where can receptor proteins be located within a cell?
Receptor proteins can be located on the cell surface or inside the cell, within the cytoplasm or nucleus.
What is a phosphorylation cascade?
A phosphorylation cascade is a sequence of signaling pathway events where one enzyme phosphorylates another, causing a chain reaction that transmits the signal.