Unit 1 biology plasma membrane

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Why is is described as the fluid mosaic model?
Phospholipid molecules form a continuous bilayer. The phospholipid are contantly moving so called fluid, protien polecules are scattered throughout the membrane like tiles on a mosaic.
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How does the membrane control entry and exit ?
Some protiens in the membrane allow passage of large or charde water soluble molecules substances that would otherwise find it difficult to pass through the membrane.
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How does it form a barrier against water soluble molecules?
Phospholipid molecules have a hydrophilic head, and a hydrophobic tail. Heads face towards the water, tails face the centre of the bilayer, not allowing any water soluable molecules to pass through.
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How does it allow cell communication?
Contains receptor protiens that respond to hormones
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How does it allow cell recognition >
Some protiens and lipids have short carbohydrate tails attached, these tell white blood cells which cells are our own.
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Card 2

Front

How does the membrane control entry and exit ?

Back

Some protiens in the membrane allow passage of large or charde water soluble molecules substances that would otherwise find it difficult to pass through the membrane.

Card 3

Front

How does it form a barrier against water soluble molecules?

Back

Preview of the front of card 3

Card 4

Front

How does it allow cell communication?

Back

Preview of the front of card 4

Card 5

Front

How does it allow cell recognition >

Back

Preview of the front of card 5

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