HO OOPO, HH-OH + + P H + 2e HH-OH CHOPO, CHzOPO, AG = 777 kJ/mol glyceraldehyde-
ID: 541223 • Letter: H
Question
HO OOPO, HH-OH + + P H + 2e HH-OH CHOPO, CHzOPO, AG = 777 kJ/mol glyceraldehyde-3 phosphate 1,3-bisphosphoglycerate (1,3-BPG) a) Calculate the AG" for the formation of 1,3-BPG from G-3-P and inorganic phosphate (reaction B above). b) Why is reaction B coupled with the reduction of NAD* (reaction A) above, when reaction A is so unfavorable? c) Reactions with an overall AG" be forward if by postitive can pulled they are followed spontaneous reactions (AG®), as is the case with conversion those negative the of G-3-P to 1,3-BPG is factor can drive this reaction what another that forward under aerobic conditions? ,Explanation / Answer
a)
Overall reaction = Reaction A + Reaction B
6.3KJ = 61.7 KJ + B
B = -55 .4 KJ/mol
delta G for the reaction B = -55.4 KJ/mol
b)
To make the reaction happen , reaction A which is having high +ve delta G is copuled with reaction B which is
having -ve delta G value .
The energy released by this highly exergonic oxidation reaction drives the endergonic second reaction
c)
In aerobic conditions pyruvate is converted to acetyl coenzyme A (acetyl CoA).Acetyl CoA enters citric acid cycle where degrades to CO2 and H2O and the energy released during such oxidation is utilized in NADH and FADH2.
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