AP Biology Unit 4: Cell Signaling

Front

What is cell signaling?

Back

Cell signaling is the process by which cells communicate with each other to coordinate their activities, often involving signaling molecules and receptors.

Front

What role do protein kinases play in cell signaling?

Back

Protein kinases activate other relay proteins by adding a phosphate group to them, which can change the activity of the target protein.

Front

What is a G-protein coupled receptor (GPCR)?

Back

A GPCR is a type of transmembrane receptor that, when bound by a signaling molecule, activates a G-protein inside the cell, initiating a signaling cascade.

Front

What are the main stages of signal transduction?

Back

The main stages of signal transduction are Reception, Transduction, Amplification, and Response.

Front

How does thyroxine affect TSH levels?

Back

An increase in thyroxine levels leads to a decrease in TSH (thyroid stimulating hormone) levels due to negative feedback.

Front

What is the function of a tyrosine kinase receptor?

Back

Tyrosine kinase receptors are transmembrane proteins that, upon binding a ligand, phosphorylate tyrosine residues on themselves and other proteins, triggering a signaling cascade.

Front

What is the significance of amplification in signal transduction?

Back

Amplification in signal transduction allows a small number of signaling molecules to produce a large response, enhancing the cell's ability to respond to stimuli.

Front

What is a second messenger in cell signaling?

Back

A second messenger is a small molecule that transmits signals from a receptor to target molecules inside the cell, often amplifying the signal.

Front

What is the difference between paracrine and endocrine signaling?

Back

Paracrine signaling involves local signaling between nearby cells, while endocrine signaling involves hormones traveling through the bloodstream to distant target cells.

Front

What is the role of receptors in cell signaling?

Back

Receptors are proteins that bind to signaling molecules (ligands) and initiate a cellular response, playing a crucial role in communication.