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

Front

What are secondary messengers in signal transduction?

Back

Secondary messengers are molecules that relay signals received at receptors on the cell surface to target molecules inside the cell, amplifying the strength of the signal. Examples include Ca²⁺ and cAMP.

Front

Do all cells respond to the same ligand in the same way?

Back

No, different cells can respond differently to the same ligand due to variations in receptor types, signaling pathways, and cellular context.

Front

Does the ligand travel through the signal transduction pathway?

Back

No, the ligand binds to a receptor on the cell surface, initiating a cascade of intracellular signaling without traveling through the pathway itself.

Front

What is the role of Ca²⁺ in signal transduction?

Back

Ca²⁺ acts as a secondary messenger that helps propagate the signal within the cell, often leading to various cellular responses.

Front

What is a signaling molecule called?

Back

A signaling molecule is called a ligand.

Front

What is the function of a receptor in signal transduction?

Back

Receptors are proteins on the cell surface or inside the cell that bind to ligands, initiating a signal transduction pathway.

Front

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

Back

A primary messenger is the initial signaling molecule (like a hormone) that binds to a receptor, while a secondary messenger is a molecule that transmits the signal inside the cell after the receptor is activated.

Front

Can the same ligand have different effects on different types of cells?

Back

Yes, the same ligand can trigger different responses in different cell types due to variations in receptor types and intracellular signaling pathways.

Front

What is cAMP and its role in signal transduction?

Back

cAMP (cyclic adenosine monophosphate) is a secondary messenger that transmits signals from receptors to target proteins, often activating protein kinases.

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 cell, enhancing the effectiveness of the signal.