IB Biology Topic B2.1.10 Fluid Mosaic Model of Membrane Structure Revision Notes (SL/HL)

IB Biology Topic B2.1.10 Fluid Mosaic Model of Membrane Structure Revision Notes (SL/HL) | RevisionDojo

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The Fluid Mosaic Model Describes the Membrane as Fluid and Varied

The fluid mosaic model describes the membrane as a flexible, moving mix of molecules.
1. Fluid: components can move sideways within the layer.
2. Mosaic: proteins and other molecules are scattered through the membrane like tiles.
This lets the membrane act as a selective barrier while staying flexible.

Four Components Make Up the Membrane

Phospholipid bilayer
1. Two layers of phospholipids form the base of the membrane, with hydrophilic heads facing the water and hydrophobic tails meeting in the middle.
2. This hydrophobic core is what makes the membrane selectively permeable.
Cholesterol
1. Cholesterol sits between the phospholipids and helps hold membrane fluidity steady as temperature changes.
Membrane proteins
1. Integral proteins are embedded in the bilayer, and peripheral proteins attach to the surface.
2. They handle jobs such as transport, signalling, and structural support.

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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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The Fluid Mosaic Model Describes the Membrane as Fluid and Varied

The fluid mosaic model describes the membrane as a flexible, moving mix of molecules.
1. Fluid: components can move sideways within the layer.
2. Mosaic: proteins and other molecules are scattered through the membrane like tiles.
This lets the membrane act as a selective barrier while staying flexible.

Four Components Make Up the Membrane

Phospholipid bilayer
1. Two layers of phospholipids form the base of the membrane, with hydrophilic heads facing the water and hydrophobic tails meeting in the middle.
2. This hydrophobic core is what makes the membrane selectively permeable.
Cholesterol
1. Cholesterol sits between the phospholipids and helps hold membrane fluidity steady as temperature changes.
Membrane proteins
1. Integral proteins are embedded in the bilayer, and peripheral proteins attach to the surface.
2. They handle jobs such as transport, signalling, and structural support.

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 B2.1.10: Fluid Mosaic Model of Membrane Structure Notes

The Fluid Mosaic Model Describes the Membrane as Fluid and Varied

Four Components Make Up the Membrane

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

The Fluid Mosaic Model Describes the Membrane as Fluid and Varied

Four Components Make Up the Membrane

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