AP Bio Topic 4.1-4.4

Front

What is endocrine signaling?

Back

Endocrine signaling is a form of long-distance signaling in which hormones are released into the bloodstream and travel to target organs or cells to elicit a response.

Front

What is autocrine signaling?

Back

Autocrine signaling is a type of self-signaling where a cell produces signals that bind to receptors on its own surface, leading to a response.

Front

What is paracrine signaling?

Back

Paracrine signaling involves the release of signaling molecules that affect nearby cells, allowing for localized communication.

Front

What is the role of protein kinases in cell signaling?

Back

Protein kinases are enzymes that transfer phosphate groups from ATP to specific proteins, which can activate or deactivate the target proteins, thus regulating cellular activities.

Front

What is a phosphorylation cascade?

Back

A phosphorylation cascade is a series of events in which one protein kinase activates another, leading to a rapid amplification of the signal and a coordinated cellular response.

Front

What is the significance of signal amplification in cellular responses?

Back

Signal amplification allows a small initial signal to produce a large response, enabling cells to respond effectively to low concentrations of signaling molecules.

Front

What is apoptosis?

Back

Apoptosis is a programmed cell death process that is crucial for maintaining homeostasis and eliminating damaged or unnecessary cells.

Front

What receptors are involved in apoptosis signaling?

Back

Receptors such as TGF-B RI/RII are involved in signaling pathways that lead to apoptosis.

Front

How is a cellular response terminated?

Back

A cellular response is typically terminated when the ligand and receptor separate, stopping the signaling process.

Front

What is the function of second messengers in signal transduction?

Back

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