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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.
R e striction enzyme analysis: The restriction endonuclease analysis of viral DNA fragments or DNA fingerprinting discovered in 1970s has revolutionized the study o
Advantage of solar energy: 1. It is renewable: it produce comes from sun, so it is plentiful and will always be there as long we need it . 2. Solar
What is Dinoflagellates ? Dinoflagellata or dinoflagellates , are characteristically unicellular photosynthetic organisms that usually have two flagellae. One flagellum typi
Insulators Numerous experiments showed that a transgene is generally poorly expressed when it contains a cDNA rather than the corresponding genomic DNA; when it is integrated a
Q. Define Primary and Somatic Sensory Area? Primary Sensory Area - Located in postcentral gyrus in parietal lobes (just posterior to central sulcus). Neurons here receive info
Explain Basal Metabolism Rate (BMR) - Ageing? From age 25 years, the basal metabolism decreases by about 2 percent for each decade due to the increasing proportion of body fat
classification mollusca
Briefly explain how amniocentesis and chorionic villi sampling are used in genetic screening. A small sample is removed from the amniotic fluid surrounding the fetus or from t
Preparation of Patient for Fasting Blood Sugar Analysis 1. Blood for fasting blood sugar (plasma glucose) analysis should be drawn after the individual has fasted overnight (8-
Post removal Types of post : -Active threaded -Passive -Custom casted Cement used : -Traditional cement -bonded with a composite resin -Dentin-bonding agent -Pro
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