AP Bio Insta-Review Topic 4.2: Intro to Signal Transduction

Front

What is signal transduction?

Back

Signal transduction is the process by which a cell responds to external signals through a series of molecular events, leading to a cellular response.

Front

What is a ligand?

Back

A ligand is a molecule that binds to a specific receptor on a cell, initiating a signal transduction pathway.

Front

What is the role of receptors in signal transduction?

Back

Receptors are proteins on the cell surface or inside the cell that bind to ligands and trigger a response in the cell.

Front

What are secondary messengers?

Back

Secondary messengers are molecules that relay signals received at receptors on the cell surface to target molecules inside the cell, amplifying the signal.

Front

Give two examples of secondary messengers.

Back

Calcium ions (Ca²⁺) and cyclic adenosine monophosphate (cAMP) are common examples of secondary messengers.

Front

How do different cells respond to the same signal?

Back

Different cells can respond to the same signal in various ways depending on their specific receptors and the intracellular pathways activated.

Front

Where is calcium stored in muscle cells?

Back

Calcium is primarily stored in the smooth endoplasmic reticulum (Smooth ER) of muscle cells.

Front

What happens when a ligand binds to its receptor?

Back

When a ligand binds to its receptor, it causes a conformational change in the receptor, activating the signal transduction pathway.

Front

What is the difference between a primary messenger and a secondary messenger?

Back

A primary messenger (like a ligand) is the initial signal that binds to a receptor, while a secondary messenger is produced or released inside the cell as a result of the receptor's activation.

Front

What is the significance of signal amplification in signal transduction?

Back

Signal amplification allows a small number of signaling molecules to produce a large response in the target cell, enhancing the effectiveness of the signal.