IB Biology Topic C3.1.20 Auxin Efflux Carriers Revision Notes (HL)

IB Biology Topic C3.1.20 Auxin Efflux Carriers Revision Notes (HL) | RevisionDojo

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Auxin Efflux Carriers Build the Concentration Gradients That Direct Plant Growth

Auxin is a key phytohormone that regulates plant growth and development.
It can diffuse freely into plant cells but cannot leave without special proteins.

Auxin Diffuses In Freely but Needs a Pump to Get Out

Step 1: Passive Diffusion In

Auxin enters plant cells by passive diffusion.
In the acidic cell wall, auxin is uncharged, so it crosses the plasma membrane easily.

Note

The cytoplasm is slightly alkaline, so auxin loses a proton and becomes negatively charged.
The charged form is trapped inside and cannot diffuse back out.

Step 2: Active Transport Out via Efflux Carriers

Once inside, auxin is charged and cannot diffuse out.
To move auxin out, plants use auxin efflux carriers.

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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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Auxin Efflux Carriers Build the Concentration Gradients That Direct Plant Growth

Auxin is a key phytohormone that regulates plant growth and development.
It can diffuse freely into plant cells but cannot leave without special proteins.

Auxin Diffuses In Freely but Needs a Pump to Get Out

Step 1: Passive Diffusion In

Auxin enters plant cells by passive diffusion.
In the acidic cell wall, auxin is uncharged, so it crosses the plasma membrane easily.

Note

The cytoplasm is slightly alkaline, so auxin loses a proton and becomes negatively charged.
The charged form is trapped inside and cannot diffuse back out.

Step 2: Active Transport Out via Efflux Carriers

Once inside, auxin is charged and cannot diffuse out.
To move auxin out, plants use auxin efflux carriers.

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.

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C3.1.20: Auxin Efflux Carriers Notes

Auxin Efflux Carriers Build the Concentration Gradients That Direct Plant Growth

Auxin Diffuses In Freely but Needs a Pump to Get Out

Step 1: Passive Diffusion In

Step 2: Active Transport Out via Efflux Carriers

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

Auxin Efflux Carriers Build the Concentration Gradients That Direct Plant Growth

Auxin Diffuses In Freely but Needs a Pump to Get Out

Step 1: Passive Diffusion In

Step 2: Active Transport Out via Efflux Carriers

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