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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.
adaptation of the phylum protozoa to its function
What is eukaryotic cell?
Explain Senning Procedure ? Operation is performed by ascending arteries and separate SVC and IVC cannulation. If the operation is done under deep hypothermic circulatory arres
Functions of Stomata The cuticle forms outermost surface of the leaf and offers resistance to the evaporation of water vapour and entry of carbon dioxide necessary for photosy
Calculate the molar concentration of illinic acid and of its conjugate base illinate ion (in moles/L; M) in a 0.002 M illinate buffer at pH 12.0. The pKa of illinic acid is 6.7. En
Q. What is Gastritis? Gastritis is an inflammatory lesion of the gastric mucosa, (the inner lining of the stomach). The problem is seen in two forms: a) Acute gastritis
Bovine ephemeral fever Ephemeral fever is commonly known as 'three-day sickness'. It affects mainly cattle and occasionally sheep in India. Causative agent is a mosquito-borne vir
Explain about the essential fat in Humans? For the body to function normally, certain amount of body fat is required. This is called essential fat. For women, average amount of
similarities of male and female
Gluconeogenesis: When diet is deficient incarbohydrates. Glucose or glycogen is formed from noncarbohydrate compounds principally from certain amino acids and the glycerol of
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