Most important and abundant one are the phospholipids - amphiphatic molecules with an hydrophilic head and a hydrophobic hydrocarbon tails. They compose the membrane bilayer. Also important are the membrane proteins, which can be periheric and internal and can serve as channels, receptors, pumps etc.
Depending on the cell type the membrane can also contain cholesterol (in animal cells, enhances the membrane stability) or hopanes(in prokaryotes, same function as cholesterol) or ether-phospholipids with branched hydroharbon tails(in archaea, make the membranes more stable and resistant to severe conditions, as archaeas are extremophiles)
Hi there! I believe the answer is:
D. An explanation of natural events that is well supported by scientific evidence
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ATMOSPHERE LAYERS: Troposphere, Stratosphere, Mesosphere and Thermosphere
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A very large star of high luminosity and low surface temperature. Red giants are thought to be in a late stage of evolution when no hydrogen remains in the core to fuel nuclear fusion.
Answer:
Option D, to inform readers of the reasons why the Grimms
collected their tales
Explanation:
The Grim brothers have a firm belief that the actual form a culture which is the most natural one is linguist and is dependent on history and in order to understand and follow it Grim brothers discovered and saved the fairy tales. This objective of Grim brothers has been displayed through their essay. The Grim brothers got motivated to do so because they believed that industrialization in long run would erase these classics from memory and hence these stories need to be protected.
Option D is correct.
