08 AP Biology Cell Signaling

Front

What is a G-protein coupled receptor?

Back

A G-protein coupled receptor (GPCR) is a type of transmembrane receptor that detects molecules outside the cell and activates internal signal transduction pathways and cellular responses.

Front

What is the role of protein kinase in cell signaling?

Back

Protein kinase is an enzyme that transfers a phosphate group from ATP to a protein, thereby activating or deactivating the protein and influencing cellular activity.

Front

What is the significance of GTP in G proteins?

Back

GTP (Guanosine triphosphate) is a nucleotide that binds to the active form of G proteins, enabling them to transmit signals from activated receptors to target proteins.

Front

What does signal amplification mean in cell signaling?

Back

Signal amplification refers to the process by which a small number of signaling molecules can produce a large response in the target cell, often through a cascade of biochemical reactions.

Front

What is a hormone?

Back

A hormone is a chemical messenger that is secreted into the bloodstream and travels to target cells to regulate physiological processes.

Front

What is the function of a tyrosine kinase receptor?

Back

Tyrosine kinase receptors are a class of receptors that, upon binding to a ligand, activate their intrinsic kinase activity, leading to phosphorylation of tyrosine residues on target proteins.

Front

What is the difference between a local regulator and a hormone?

Back

Local regulators are signaling molecules that act on nearby cells, while hormones are chemical messengers that travel through the bloodstream to distant target cells.

Front

What is the role of G proteins in signal transduction?

Back

G proteins act as molecular switches that relay signals from activated receptors to downstream effectors, influencing various cellular responses.

Front

What is the function of protein phosphatase?

Back

Protein phosphatase is an enzyme that removes phosphate groups from proteins, often reversing the action of protein kinases and regulating cellular activity.

Front

What is a gated ion channel?

Back

A gated ion channel is a transmembrane protein that opens or closes in response to specific signals, allowing ions to flow across the membrane and alter the cell's electrical potential.