#372 What is the structure of the cell membrane

What is the structure of the cell membrane - Chemistry

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11. What is the structure of the cell membrane?

12. Why is the Tg of PTFE higher than that of FEP?

13. Compare and contrast dendrimers with block copolymer micelles, globular proteins, inorganic nanoparticles in terms of attributes and likely utility in the following applications: (a) drug delivery; (b) homogenous catalysis; and (c) solubilization. 14. Name three important synthetic fibers.

15. Which of the following might you expect would increase their conductivity when doped: (a) PS, (b) PPO, (c) nylon 66, or (d) aramids?

16. When a dilute solution of block copolymers undergoes micellization, i.e., some numbers of chains aggregate into a (usually spherical) assembly to shield one block from the solvent it does not like, the light scattering intensity increases. In fact, if micellization is induced by changing temperature at a fixed concentration, the ratio of the intensity after micellization to that before micellization is a good estimate of the average aggregation number of the micelles. Explain this observation.

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11) Structure of cell membrane:

Cell membrane contains phospholipids which are main components. These phospholilids made up of a phosphate group and two fatty acid. The phosphate group is head while fatty acids are working as tails.

These properties of phospholipids allow them to spontaneously form a double-layered membrane. In an aqueous solution, the hydrophilic heads of phospholipids will orient themselves to be on the outside, while the hydrophobic tails will be on the inside. In addition to phospholipids, the cell membrane also contains glycolipids and sterols.

12) Higher Tg of PTFE than FEP:

FEP (fluorinated ethylene propylene) contains some of the same non-stick qualities of PTFE (polytetrafluoroethylene) but has different structure. FEP is softer than PTFE, hence  melts at a lower temperature than PTFE. Therefore, PTFE has higher Tg (glass temperature) than FEP.