Structure and Role of Cell Membranes (OCR A-Level Biology A): Flashcards
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Type of barrier cell membranes act as
Type of barrier cell membranes act as
Selective/partially permeable barriers
Who proposed fluid mosaic model & when?
Who proposed fluid mosaic model & when?
Singer & Nicolson, 1972
'Fluid' in fluid mosaic model means
'Fluid' in fluid mosaic model means
Components can move laterally in membrane
'Mosaic' in fluid mosaic model refers to
'Mosaic' in fluid mosaic model refers to
Scattered pattern of proteins in lipid bilayer
Phospholipid head: hydrophilic or hydrophobic?
Phospholipid head: hydrophilic or hydrophobic?
Hydrophilic (water-attracting, polar)
Channel protein function
Channel protein function
Form pores for diffusion of small polar substances
How carrier proteins transport substances
How carrier proteins transport substances
Change shape to move substances across membrane
Three glycoprotein functions
Three glycoprotein functions
Stabilization, cell signalling, cell recognition
Cholesterol's role in membranes
Cholesterol's role in membranes
Regulates fluidity (prevents excess fluidity & rigidity)
Temp when membrane proteins denature
Temp when membrane proteins denature
40°C (irreversible)