IB Biology Topic B2.1.7 Pump Proteins for Active Transport Revision Notes (SL/HL)

IB Biology Topic B2.1.7 Pump Proteins for Active Transport Revision Notes (SL/HL) | RevisionDojo

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Active Transport: Pumps Move Substances Against the Gradient

Cells often need to move substances against their concentration gradient, from low to high concentration.
This process, called active transport, is done by pump proteins in the cell membrane.

Definition

Active transport

Active transport is the movement of molecules or ions across a membrane against their concentration gradient (from low to high concentration), which requires energy.

Tip

Facilitated diffusion is passive, but active transport needs energy from ATP.

Pumps Differ From Channels in Three Key Ways

Energy use
1. Pumps need energy to work, while diffusion through channels is passive and uses none.
Direction
1. Pumps move particles in only one direction.
2. Channels let particles move either way, depending on the gradient.
Against the gradient
1. Pumps move particles against their concentration gradient, from low to high.
2. Facilitated diffusion always runs down the gradient.

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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 nisi ut aliquip ex ea commodo consequat.

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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Active Transport: Pumps Move Substances Against the Gradient

Cells often need to move substances against their concentration gradient, from low to high concentration.
This process, called active transport, is done by pump proteins in the cell membrane.

Definition

Active transport

Active transport is the movement of molecules or ions across a membrane against their concentration gradient (from low to high concentration), which requires energy.

Tip

Facilitated diffusion is passive, but active transport needs energy from ATP.

Pumps Differ From Channels in Three Key Ways

Energy use
1. Pumps need energy to work, while diffusion through channels is passive and uses none.
Direction
1. Pumps move particles in only one direction.
2. Channels let particles move either way, depending on the gradient.
Against the gradient
1. Pumps move particles against their concentration gradient, from low to high.
2. Facilitated diffusion always runs down the gradient.

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 B2.1.7: Pump Proteins for Active Transport Notes

Active Transport: Pumps Move Substances Against the Gradient

Pumps Differ From Channels in Three Key Ways

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

Active Transport: Pumps Move Substances Against the Gradient

Pumps Differ From Channels in Three Key Ways

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