Cell Communication & Transduction Pathway Practice

Front

What is a ligand in cell communication?

Back

A ligand is a molecule that binds to a specific receptor on a target cell, initiating a cellular response.

Front

How do ligands exhibit cell specificity?

Back

Each cell has different receptors that bind to specific ligands, allowing for targeted communication.

Front

What is signal amplification in cell signaling?

Back

Signal amplification is the process by which a small number of signaling molecules can produce a large response in the target cell, often achieved through enzyme cascades.

Front

What role do protein kinases play in signal transduction?

Back

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

Front

What is the function of protein phosphatases?

Back

Protein phosphatases remove phosphate groups from proteins, reversing the action of kinases and regulating cellular activity.

Front

How do steroid hormones differ from protein hormones?

Back

Steroid hormones are hydrophobic and can pass through cell membranes, while protein hormones are hydrophilic and bind to receptors on the cell surface.

Front

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

Back

A GPCR is a membrane receptor that, when bound by a ligand, activates a G-protein inside the cell, triggering a signaling cascade.

Front

What is the significance of epinephrine in cell signaling?

Back

Epinephrine is a hormone that binds to GPCRs, initiating a response that prepares the body for 'fight or flight' situations.

Front

What is the first step in a signal transduction pathway?

Back

The first step is the binding of a ligand to its specific receptor on the target cell.

Front

What is the role 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.