4.1 structure of the cell-surface membrane Flashcards

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1
Q

describe the (5) different substances of the cell-surface membrane.

A
  • phospholipid bilayer: hydrophilic phosphate head & hydrophobic fatty-acid tail
  • proteins (extrinsic, intrinsic, channels / carrier)
  • glycolipids
  • cholesterol
  • glycoproteins
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2
Q

describe the advantages of the phospholipid bilayer.

A
  • allow lipid-soluble molecules to pass through
  • prevent water-soluble substances to pass through
  • flexible and self-sealing
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3
Q

describe the uses of extrinsic & intrinsic proteins on the cell-surface membrane.

A
  • extrinsic protein: on 1 side of bilayer only, acts as mechanical support or as cell receptors with glycolipids
  • intrinsic protein: spans through both bilayer, acts as protein channels & carrier proteins
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4
Q

describe the role of cholesterol in the cell-surface membrane.

A
  • adds strength to membranes
  • prevent leakage of water (very hydrophobic)
  • makes membrane less fluid at high temperatures
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5
Q

describe the role of glycolipids in the cell-surface membrane.

A
  • acts as recognition sites
  • maintain stability
  • help cells to attach & form tissues
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6
Q

explain what the fluid-mosaic model meant.

A

fluid: flexible phospholipid molecules could move relative to one another
mosaic: proteins embedded varies in shape, size and pattern

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7
Q

what molecules doesn’t diffuse through the cell-surface membrane?

A
  • insoluble in lipids
  • large-sized
  • polar / electrically charged
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