THE FLUID MOSIAC MODEL Label the parts of the plasmo membrane in the diagram bel
ID: 302860 • Letter: T
Question
THE FLUID MOSIAC MODEL Label the parts of the plasmo membrane in the diagram below. Use the table on the right to help you if needed Outside of Ce 6. Why is the cell membrane also known as a "phospholipid bilayer?" 7. Glycolipids and glycoproteins have what type of molecule attached to them? 8. How many layers of phospholipids makeup the plasma membrane? 9. The cell membrane is both fluid and asymmetrical. Discuss asymmetry of the plasma membrane, as well as the enzyme involved. Explain properties that contribute to the fluidity of the cell membrane? 10. Give one way in which active transport differs from facilitated diffusion. 11. Label the following diagram:Explanation / Answer
Answer no.6
The structure is called as a phospholipid bilayer because it is composed of two layers of fat cells organized in two sheets
Answer no.7
Glycolipid contains carbohydrate-attached lipids which are associated with a cell membrane.They play important roles in providing energy and serve as markers for cellular recognition.And Glycoproteins are proteins which contains oligosaccharide chains(glycans) covalently attached to amino acid side chains.
Answer no.8
The phospholipid in the plasma membrane are arranged in two layers, called a phospholipid bilayer. Each phospholipid molecule has a head and two tails.
Answer no.9
The phospholipid in the plasma membrane are asymmetrically distributed across the bilayer;the amine-containing phospholipids are enriched on the cytoplasmic surface of the plasma membrane, while the choline-containing and sphingolipids are enriched on the outer surface. The asymmetry is not usually not absolute, except for glycolipids.In the human erythrocytes,for example, the phospholipids such as sphingomyelin and phosphatidylcholine are mostly found in the extracytoplasmic leaflet,whereas phosphatidylserine and phosphatidylethanolamine are preferentially located on the cytoplasmic face.The maintenance of transbilayer lipid asymmetry is essential for normal membrane function. Once lipid asymmetry has been established,it is maintained by a combination of slow transbilayer diffusion, protein-lipid interactions and protein-mediated transport.
The enzymes involved are Flippase and floppases.They catalyze the movement of lipids across the plasma membrane. These activities are classified according to substrate specificity, requirements for energy and direction of transport. Two classes of transport activities have been described that are responsible for the ATP dependent transport of lipids. The most well-characterized activity catalyzed by flippase,a P-type ATPase, transport glycerophospholipid from the outer monolayer to the cytoplasmic surface of the plasma membrane.A second ATP dependent activity,catalyzed by floppases,ABC transport protein,transport lipid in the opposite direction.
Properties that contribute the fluidity the fluidity of the cell membrane is:
1.The mosaic characteristic of the membrane helps the plasma membrane remain fluid.
2.The second factor that leads to the fluidity is the nature of the phospholipids themselves
3.In animals the third factor that keeps the membrane fluid is cholesterol.
Answer no.10
Active transport is the transport of molecules across the plasma membrane from low concentration to the higher concentration by means of a transmembrane protein, using ATP energy whereas, facilitated diffusion is the transport of molecules across the plasma membrane from higher concentration to a lower concentration by means of transmembrane proteins
Answer no.11
1. glycoprotein
2. Peripheral protein
3. Glycolipid
4.cholestrol
5.integral protein
6.protein channel
7.phospholipid
8.peripheral protein
9.phospholipid bilayer
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