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A pure phospholipid bilayer with its hydrophobic interior, is permeable to water and gases such as O2, CO2, N2 and small uncharged polar molecules such as urea, ethanol, but is impermeable to large uncharged polar molecules such as glucose, ions (Na+ , K+ , Cl-, Ca2+ ) and charged polar molecules instance for amino acids, ATP, glucose 6-phosphate. The initial group of molecules can cross a biological membrane unaided and without an input of energy, whereas the latter group requires the presence of integral membrane transport proteins and, in many cases an input of energy to travel by the otherwise impermeable membrane barrier. Thus the plasma membrane and the membranes of internal organelles are selectively permeable barriers and maintaining a distinct internal environment.
Q. Explain the process of Angioplasty? Inflation of stenotic segment causes stretching of the vessel, fracture of the intimal plaque, partial disruption of the media and adven
State the Disorders of sleep The need for sleep varies considerably from one person to another, as well as in the same person at different stages of life. We have all been told
Define the Psychological problems - Effect of Obesity? Obese people may be exposed to ridicule and discrimination in areas like employment, promotions and social interactions.
Q. Is the epithelium vascularized? How do oxygen and nutrients reach the epithelium? Why is this feature an important evolutionary acquisition? Epithelia are not vascularized c
Which of the following compounds does NOT contain an amine? Select one: a. Glutamine b. Acetate ion c. Urea d. Guanidinium ion e. Creatine
Digestion of fats A. Production of bile salts in the liver and the secretion of those bile salts into the small intestine. B. Production of lipase in the pancreas and
Define Limitations for underwater weighing method? This method is expensive, time consuming and usually requires a lot of equipment and space. The subject needs to be
The sequence for the Beta Actin gene (ACTB) is given below. Which pair of primers (designed to amplify the entire sequence below) could be used to successfully produce the beta act
Sulphur is one of important of proteins vitamins and hormones. It plays a very crucial role in health of both plants and animals. Most of earth sulphur is tied up in rocks and salt
Name and describe any three adaptations of mangroves to the conditions prevailing in the Sunderbans.
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