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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.
Why is an S strain of bacteria able to cause disease in mammals but a R strain is not? The slippery capsule stops the cells of the defence system from capturing and destroying
Algae Advantages a) Produces proteins which have almost all the Essential Amino acids. b) Rich in tyrosine and serine, low in sulphur containing amino acids.
Define Spiral cleavage in brief. Pattern of cell division in the developing embryo where products of the cell divisions shift by rotating either counterclockwise or clockwise s
Management In case of small defects surgical treatment is not indicated because spontaneous closure may occur before one to two years of age. Patient is treated for conges
What is the pleiotropy? The Pleiotropy (or pliotropy) is the phenomenon in which a single gene conditions several various phenotypical traits. Few phenotypical traits may be
Animal products too are widely used in medicines by traditional societies, and in some urbanized societies that believe in traditional animal-based remedies. Examples of such produ
What problem would most likely to occur if a haploid cell attempted to perform meiosis?
why uracil is present in rna and thymine in dna?
What are the three phases into which the HIV infection is often divided? The HIV infection is often separated into three phases: the acute phase, from the infection to 1 until
Q. What are some major differences of the vertebrate nervous systems comparing to invertebrates? In vertebrates the nervous system is well-characterized, having dorsal neural c
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