6

Summary The redox potential widely quoted in text books for the half-reaction reduction of FAD to FADH2 is indeed inconsistent with the observed direction of several reactions involving this coenzyme, including its reduction of NAD+ in the dihydrolipoamide dehydrogenase reaction. The reason for this is that the value quoted is determined for free FAD in ...


6

Summary It is the nature of the biochemical reaction that determines whether a reaction of ATP involves hydrolysis of the β- or γ- phosphoanhydride bond. If a part of the ATP molecule is incorporated into one of the products, the choice of bond to be cleaved emerges from the chemistry of the reaction. If the hydrolysis (with a negative free energy change, ΔG)...


5

Summary The apparent paradox is resolved by the fact that not all tissues possess receptors that cause them to respond to glucagon or, more generally, to the same hormone. Where different tissues do respond to the same hormone, the tissue response may differ because of differences between the pathways or particular enzymes within the different tissues. ...


3

As the concern expressed by the poster has recurred in an essentially similar question despite the excellent answer by @MattdDMo, I shall provide an additional answer labouring the basic biochemical points. Inorganic phosphate (the term used to describe the mixture of different phosphate ions present at physiological pH) in animals is derived from the diet. ...


1

DNA polymerase uses this form of the reaction NTP -> NMP + PPi which is followed by a rapid degradation of pyrophosphate for a very important reason. It makes the reaction irreversible (or quasi irreversible). The backward reaction is (practically) impossible because in order for it to take place, multiple compounds must simultaneously reunite in the ...


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