Cell membrane Essay Samples and Topic Ideas
cell membrane and calculated that the area they should occupy if they formed a monolayer is twice greater than the area of the area of the Plasma membrane. Where they deduced that they should be arranged in a bilayer. But phospholipids are not the only components of the membranes, there are also many proteins and some carbohydrates. From this, another theory was created in 1935, Hugh Davson and James Danielli proposed that in addition to the phospholipid bilay. This model is known as Davson-Danielli's sandwich model. Finally we have the theory of Singer and Nicolson that emerged in 1966, better known as a fluid mosaic model since it was proposed that the membrane is formed by two...
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cell membrane for copper excretion that is present in excess. Liver hepatocytes are the site of two important physiological processes that involve copper: first, ATP7B provides copper for incorporation into apoceruloplasmine for functional ceruloplasmin synthesis;Second, ATP7B facilitates the biliary copper excretion process. The inactivation of ATP7A (the gene associated with the disease of cerebral copper deficiency, or Menkes disease) or ATP7B produces a marked copper unbalance, next to the inactivation of specific copper dependent enzymes, and is clinically manifested as Menkes or WD, respectively. In addition, Mednik syndrome (mental retardation, enteropathy, deafness, neuropathy, ichthiosis...
cell membrane (Hedlund, Et al. 865). Extremophiles and Metabolic Diversity Extremophiles exist in an environment of extreme conditions since they have dynamic flexibility that enables them to adjust to any condition (Hedlund, Et al. 865). For instance, the viable bacterial spores have a long lifespan on earth due to its extreme endurance to radiations and other life-threatening conditions. Microorganisms would often survive wherever they are found. The diverse genetic lineage is a common feature that enhances their ability to exist under any conditions (Tazi Et al., 525). The metabolic diversity also changes based on the increased catalytic activity and amino acid accumulation. The use of heat...
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cell membrane (Chudobova et al., 2014). The gram-positive bacteria have a two-walled membrane that helps retain the stain. Their cell membrane is composed of a cytoplasmic membrane and a cell wall. The cell wall is basically made up of peptidoglycan-polysaccharide that is important in providing the bacteria with resilience and rigidity (Clutterbuck et al., 2007). Additionally, this compound is useful for the bacteria’s capability to stain. On the other hand, gram-negative bacteria have three cell wall layers namely; the outer membrane, periplasmic space, and a cytoplasmic layer. The outermost membrane and cytoplasmic layer are made up of phospholipids. The peptidoglycan layer is situated in the...
cell membrane for an animal cell similar to the shopping mall doors. This cell membrane has three layers in its complex structure. The wall limits what goes into the cell and goes out just as a mall’s wall keeps away thieves and burglars. It works like a door not allowing huge items inside. For example, one cannot enter into the mall while driving their car or a tractor. The cell wall in the plant cell is hard enough to protect the cell membrane and other organelles. It is a protective cover of the cell that ensures that the integrity of the cell membrane is maintained at all times. Without the cell wall in plant cells, it would be destroyed by any objects and interferences in the environment....
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