Describe the fluid mosaic model of the plasma membrane. Discuss
the role of the membrane in...
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Biology
Describe the fluid mosaic model of the plasma membrane. Discussthe role of the membrane in the movement of materials through it byeach of the following processes.
Active transport
Passive transport
Describe negative and positive feedback loops, and discuss howfeedback mechanisms regulate each of the following.
The menstrual cycle in a nonpregnant human female.
Blood glucose levels in humans.
Discuss the adaptations that have enabled flowering plants toovercome the following problems associated with life on land.
The absence of an aquatic environment for reproduction
The absence of an aquatic environment to support the plantbody
Dehydration of the plant
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The lipid bilayer was originally proposed by Davson and Daniellein 1935 Later the structure of the biomembranes was described asa fluid mosaic model Singer and Nicolson 1972A The phospholipids are arranged in bilayers with the polar headgroups oriented towards the extracellular side and the cytoplasmicside with a hydrophobic core The distribution of the phospholipidsis such that choline containing phospholipids are mainly in theexternal layer and ethanolamine and serine containing phospholipidsin the inner layerB Each leaflet is 25 thick with the head portion 10 and tail15 thick The total thickness is about 50 to 80 C The lipid bilayer shows free lateral movement of its componentshence the membrane is said to be fluid in nature Fluidity enablesthe membrane to perform endocytosis and exocytosisD However the components do not freely move from inner toouter layer or outer to inner layer flipflop movement isrestricted During apoptosis programed cell death flip flopmovement occursThis flipflop movement is catalyzed by enzymes Flippasescatalyze the transfer of amino phospholipids across the
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