Signal Transduction & Cell Communication

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 the role of G-protein coupled receptors (GPCRs) in signal transduction?

Back

GPCRs are membrane proteins that detect extracellular signals and activate intracellular signal transduction pathways, often involving G-proteins.

Front

What is the function of adenyl cyclase in the signal transduction pathway?

Back

Adenyl cyclase converts ATP to cyclic AMP (cAMP), which acts as a secondary messenger in the signaling pathway.

Front

What is cAMP and its role in cell signaling?

Back

Cyclic AMP (cAMP) is a secondary messenger that transmits signals from GPCRs to activate protein kinases, leading to various cellular responses.

Front

What is the correct order of the stages in cell communication?

Back

The correct order is reception, transduction, and response.

Front

What is apoptosis?

Back

Apoptosis is the process of programmed cell death that occurs in multicellular organisms, allowing for the removal of unnecessary or damaged cells.

Front

What is a positive feedback loop?

Back

A positive feedback loop is a process in which the end product of a reaction enhances or stimulates the process, such as contractions during childbirth.

Front

What is a negative feedback system?

Back

A negative feedback system is a control mechanism that counteracts changes in a system, helping to maintain homeostasis, such as temperature regulation.

Front

What is the role of protein kinases in signal transduction?

Back

Protein kinases are enzymes that modify other proteins by adding phosphate groups, which can activate or deactivate the target proteins in signaling pathways.

Front

What is the difference between autocrine and paracrine signaling?

Back

Autocrine signaling occurs when a cell targets itself, while paracrine signaling involves a cell communicating with nearby cells.