AP Biology Topic 4.2*: 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 role do phosphatases play in signal transduction?

Back

Phosphatases are enzymes that remove phosphate groups from proteins, effectively shutting down signaling pathways.

Front

What are plasmodesmata?

Back

Plasmodesmata are microscopic channels that traverse the cell walls of plant cells, allowing for communication and transport of substances between cells.

Front

What is the function of kinases in signal transduction?

Back

Kinases are enzymes that add phosphate groups to proteins, often activating or deactivating them as part of the signaling process.

Front

What is the difference between paracrine signaling and endocrine signaling?

Back

Paracrine signaling involves the release of signals to nearby cells, while endocrine signaling involves hormones traveling through the bloodstream to distant target cells.

Front

What is the significance of signal amplification in signal transduction?

Back

Signal amplification allows a small initial signal to produce a large response, enhancing the effectiveness of the signaling process.

Front

What is a receptor in the context of signal transduction?

Back

A receptor is a protein on the cell surface or inside the cell that binds to a specific ligand, initiating a signal transduction pathway.

Front

What is the role of second messengers in signal transduction?

Back

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

Front

What is the function of gap junctions?

Back

Gap junctions are specialized intercellular connections that allow direct communication and transfer of ions and small molecules between adjacent cells.