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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.
Nutrient and Storage proteins These proteins store amino acids. Ovalbumin is the protein of egg white, used as an amino acid source for the developing embryo. Casein, the prote
Q. What do energy pyramids represent? The Energy pyramids represent the amount of accessible energy in each trophic level of the food chain.
Gibberellins in plant growth Gibberellins were first isolated from the culture of a fungus Gibberella fujikuori. Gibberellins has a significant effect on stem elongation
Define Most Probable Number Test (Multiple Tube Fermentation Test)? Presence of coliforms in the water sample can be detected by performing multiple tube fermentation test whic
Steps for Conversion of food Conversion of food is done in four steps: 1) Ingestion, mastication and swallowing: Ingestion or taking in of food and mastication are done b
define each term
How are water, mineral salts and food (sugar) transported throughout the plant? Water, mineral salts and sugar are transported throughout the plant through conductive vessels f
The Red Data Book Species judged as threatened are listed by various agencies as well as by some private organisations. The most cited of these lists is the Red Data Book. It
What are the main parts of the human ear? The human ear is separated into three mains parts: the external ear, the middle ear and the internal ear. Hearing Review - Image D
Q. Causes of gastro oesophageal reflux disease? GERD may develop due to any of the following reasons: • decreased muscle tone or abnormal relaxation of the LES, • reduced st
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