The immediate energy source for the Na-glucose symporter of the intestinal epith
ID: 880823 • Letter: T
Question
The immediate energy source for the Na-glucose symporter of the intestinal epithelial cells is (no option provided) Consider the transport of Na from the blood (where its concentration is about 140 mM) into an erythrocyte that contains 5 mM Na The transmembrane potential is about -60 mV inside negative relative to outside). The AG for this transport process is expected to be (positive/negative/zero). ABC transporters are secondary active transporters Between the fatty acids 18:3 (18 Carbons and three cis double bonds) and 18:0 (18 carbons and zero double bond), (18:3/18:0) definitely has the lower Tm Peripheral membrane proteins can be covalently linked via an ami de bond to this type of lipids in the membrane: (no option provided). Choose the lipid molecule(s) that can form lipid bilayers on its own. fatty acid glycerophospholipid sphingophospholipid C none of the three options of lipids both glycerophospholipids and sphingophospholipids all three types of lipidsExplanation / Answer
(a) The Na+ - glucose symporter of the intestinal epithelial cell and nephron cell use the energy generated due to sodium ion gradient in Na+ - K+ ATPase pump.
Hence the immediate energy source for the Na+ - glucose symporter of the intestinal epithelial cell is sodium ion gradient.
(b) Given the transmenbrane potential,E = - 60 mV
Now DeltaG for this transport process can be calculated as
DeltaG = - nFE = -1*96500C*(- 60*10-3 V) = + 5790
Hence DeltaG is positive.
(c) ABC transporters are primary active transporters.
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