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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.
Explain Arterial Switch Operation Surgery? This is the operation of choice for simple transposition of the great arteries as it ensures anatomical correction. The approach is t
Halophytes are plants that live in moist soils with high salt concentrations. Despite being surrounded my water, halophytes are often referred to as "salty desert" plants. Explain
Define Hormonal and Receptor Proteins? Hormonal proteins : Hormonal proteins coordinate the bodily activities. Several peptide and protein hormones (like insulin and growth ho
Define the Meaning of Isomerism? All monosaccharides exhibit isomerism. An asymmetric carbon or chiral carbon contains four different groups attached to it. The formula 2 n de
Person X is a healthy human who has volunteered to take experimental drug Y. Person X has a normal dinner at 6 PM on April 1 and then does not eat for 12 hours. At 5 PM on A
Q. What is the difference between metabolic acidosis and respiratory acidosis and what is the difference between metabolic alkalosis and respiratory alkalosis? Respiratory acid
wt is an air bladder and its function wt is catadromous and anadromus migration
a) What is meant by 'vaso-dilation'? b) What are the effects of vaso-dilation in the skin? (a) Vaso-dilation is an enhance in diameter of small arterioles and
Q. What is the physiological cause of the syndrome Called as cretinism? Cretinism is caused by chronic deficiency of the thyroid hormones (T4and T3) during childhood. The chron
What are the so-called "good" and "bad" cholesterol? Lipoproteins are complexes made of lipids (triglycerides and cholesterol) and proteins. The lipoproteins present dissimilar
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