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 signaling molecule that binds to a receptor to initiate 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 initiate the signal transduction process.

Front

What are secondary messengers?

Back

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

Front

Name two common secondary messengers.

Back

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

Front

What is the first step of signal transduction?

Back

The first step of signal transduction is reception, where the ligand binds to its receptor.

Front

What happens during the transduction phase?

Back

During the transduction phase, the signal is converted into a form that can bring about a cellular response, often involving a cascade of molecular interactions.

Front

What is the final step of signal transduction?

Back

The final step of signal transduction is the cellular response, where the cell reacts to the signal, such as altering gene expression or activating enzymes.

Front

How do ligands and receptors interact?

Back

Ligands bind specifically to receptors, causing a conformational change in the receptor that triggers 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 secondary messengers are molecules that relay and amplify the signal inside the cell.