Quick 10Q: Cell Communication

Front

What is a ligand?

Back

A ligand is a molecule that binds to a receptor to initiate a signal transduction pathway.

Front

Where does the ligand bind to initiate signal transduction?

Back

Receptor.

Front

Can more than one ligand bind to the same receptor?

Back

True.

Front

What is the difference between steroid and protein hormones?

Back

Steroid hormones are hydrophobic while protein hormones are hydrophilic.

Front

Where would you find a receptor for a steroid hormone?

Back

In the cytoplasm because steroids are nonpolar.

Front

What is paracrine signaling?

Back

Paracrine signaling involves the release of signaling molecules that affect nearby cells.

Front

What is hormone signaling?

Back

Hormone signaling involves the release of hormones into the bloodstream to affect distant target cells.

Front

How do steroid hormones enter a cell?

Back

Steroid hormones pass through the cell membrane due to their hydrophobic nature.

Front

What is the role of receptors in cell communication?

Back

Receptors bind to ligands and initiate a response within the cell.

Front

What is the difference between hydrophobic and hydrophilic molecules?

Back

Hydrophobic molecules do not mix with water, while hydrophilic molecules do.