AP Bio Insta-Review Topic 4.4*: Changes in Signal Transduction

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

How can a change in the receptor affect cell responses?

Back

A change in the receptor can alter the way a cell interprets signals, potentially leading to different cellular responses.

Front

What is a competitive inhibitor?

Back

A competitive inhibitor is a substance that binds to the active site of an enzyme, preventing the substrate from binding and inhibiting the enzyme's activity.

Front

What is the role of relay molecules in signal transduction?

Back

Relay molecules transmit signals from receptors to target molecules within the cell, amplifying and propagating the signal.

Front

What happens if there is a mutation in a relay molecule?

Back

A mutation in a relay molecule can disrupt the signal transduction pathway, potentially leading to altered cellular responses.

Front

What is an allosteric inhibitor?

Back

An allosteric inhibitor is a molecule that binds to an enzyme at a site other than the active site, causing a change in the enzyme's shape and reducing its activity.

Front

What is noncompetitive inhibition?

Back

Noncompetitive inhibition occurs when an inhibitor binds to an enzyme regardless of whether the substrate is bound, reducing the overall number of active enzyme molecules.

Front

Define the term 'receptor'.

Back

A receptor is a protein molecule on the surface or inside a cell that binds to specific signaling molecules, initiating a cellular response.

Front

What is the significance of signal amplification in signal transduction?

Back

Signal amplification allows a small number of signaling molecules to produce a large cellular response, enhancing the effectiveness of the signal.

Front

How do second messengers function in signal transduction?

Back

Second messengers are small molecules that relay signals received at receptors to target molecules inside the cell, facilitating a rapid response.