IB Biology Topic C2.1.7 Initiation of Signal Transduction Pathways by Receptors Revision Notes (HL)

IB Biology Topic C2.1.7 Initiation of Signal Transduction Pathways by Receptors Revision Notes (HL) | RevisionDojo

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A Bound Receptor Changes Shape and Starts the Signal Inside the Cell

Definition

Signal transduction

Signal transduction is the process by which cells respond to external signals, converting them into a cascade of chemical responses inside the cell.

Signal transduction is how a cell converts a signal from outside into a specific response inside.
It starts when a signalling molecule (the ligand) binds to a receptor.
1. Binding causes a conformational change, a change in the receptor's shape.
This shape change is what initiates the pathway, relaying the message from the receptor to the inside of the cell.
These pathways let cells respond accurately to their environment.

Analogy

Imagine you are in a crowded room and someone whispers your name.
Instantly your attention shifts to that one signal.
A cell picks out its signal in the same way, then acts on it.

Transduction Happens in Three Stages: Reception, Transduction, Response

Reception: the signalling molecule binds to the receptor.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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A Bound Receptor Changes Shape and Starts the Signal Inside the Cell

Definition

Signal transduction

Signal transduction is the process by which cells respond to external signals, converting them into a cascade of chemical responses inside the cell.

Signal transduction is how a cell converts a signal from outside into a specific response inside.
It starts when a signalling molecule (the ligand) binds to a receptor.
1. Binding causes a conformational change, a change in the receptor's shape.
This shape change is what initiates the pathway, relaying the message from the receptor to the inside of the cell.
These pathways let cells respond accurately to their environment.

Analogy

Imagine you are in a crowded room and someone whispers your name.
Instantly your attention shifts to that one signal.
A cell picks out its signal in the same way, then acts on it.

Transduction Happens in Three Stages: Reception, Transduction, Response

Reception: the signalling molecule binds to the receptor.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C2.1.7: Initiation of Signal Transduction Pathways by Receptors Notes

A Bound Receptor Changes Shape and Starts the Signal Inside the Cell

Transduction Happens in Three Stages: Reception, Transduction, Response

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A Bound Receptor Changes Shape and Starts the Signal Inside the Cell

Transduction Happens in Three Stages: Reception, Transduction, Response

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics