Cell surface membrane

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What is the cell surface membrane?
The plasma membrane that surrounds cells and forms a boundary between the cytoplasm and environment.
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What does the cell surface membrane allow?
Conditions to be established between the inside and outside of the cell.
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What does the cell surface membrane control?
The movement of substances in and out of the cell.
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What do phospholipids form?
The bilayer sheet.
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What are the functions of phospholipids in the bilayer?
Allow lipid-soluble substances to leave & enter the cell; prevent water-soluble substances entering/leaving; make the membrane flexible.
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How are proteins arranged in the phospholipid bilayer?
Extrinsic & Intrinsic
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Where are extrinsic proteins found and what do they do?
Found on the surface/embedded into the bilyaer; they give mechanical support or act as receptors for hormones.
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Where are intrinsic proteins found and what do they do?
Span the bilayer and act as carriers for water-soluble material/enzymes.
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Name some functions of proteins in the bilayer.
Structureal support; carriers; allow active transport; form ion channels; form recognition sites; act as receptors; help cells join together.
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What is the cell surface membrane referred to?
The fluid mosaic model.
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What is meant by the 'fluid' part of the fluid mosaic model?
Phospholipids move relative to one another, giving the membrane flexibility and changing shape.
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What is meant by the 'mosaic' part of the fluid mosaic model?
Proteins vary in shape, size and pattern.
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Other cards in this set

Card 2

Front

What does the cell surface membrane allow?

Back

Conditions to be established between the inside and outside of the cell.

Card 3

Front

What does the cell surface membrane control?

Back

Preview of the front of card 3

Card 4

Front

What do phospholipids form?

Back

Preview of the front of card 4

Card 5

Front

What are the functions of phospholipids in the bilayer?

Back

Preview of the front of card 5
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