4.3-4.4 signal Transduction Pathways & Changes to STP's

Front

What is a signal transduction pathway?

Back

A series of molecular events and cellular processes that lead to a cellular response following the binding of a signaling molecule to a receptor.

Front

What role do protein kinases play in signal transduction?

Back

Protein kinases activate proteins by transferring a phosphate group to them, which can change the protein's activity.

Front

What is the function of G proteins in signal transduction?

Back

G proteins act as molecular switches that relay signals from receptors to target proteins inside the cell.

Front

What is the significance of cAMP in signal transduction?

Back

cAMP (cyclic adenosine monophosphate) acts as a secondary messenger that transmits signals from receptors to target molecules within the cell.

Front

What is the difference between paracrine and autocrine signaling?

Back

Paracrine signaling involves the release of signals to nearby cells, while autocrine signaling involves a cell responding to signals it has released itself.

Front

What is the role of receptors in signal transduction pathways?

Back

Receptors are proteins that bind to signaling molecules (ligands) and initiate the signal transduction process.

Front

How does epinephrine initiate a signal transduction pathway?

Back

Epinephrine binds to a G-protein coupled receptor on the cell membrane, triggering a cascade of intracellular events.

Front

What is the outcome of signal amplification in signal transduction?

Back

Signal amplification allows a single signaling molecule to produce a large cellular response by activating multiple downstream molecules.

Front

What is the function of protein phosphatases in signal transduction?

Back

Protein phosphatases remove phosphate groups from proteins, which can deactivate or alter their function.

Front

What is juxtacrine signaling?

Back

Juxtacrine signaling involves direct communication between adjacent cells through cell surface molecules.