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Correct, all but one step in pyrimidine synthesis occurs in the cytosol, and purine synthesis occurs in the cytosol only. Nucleotides freely diffuse through nuclear pores but are actively transported through mitochondrial membranes via embedded membrane transport proteins (i.e. ATP-ADP translocators, GTP transporters, and pyrimidine nucleotide ...


3

Okay so pyruvate carboxylase is a ligase-class enzyme, meaning it forms covalent bonds. What we see is that pyruvate is carboxylated into oxaloacetate by pyruvate carboxylase, here's our proposed reaction, What this does is replenish mitochondrial oxaloacetate levels, because when we switch into lipogenesis, TCA intermediates must be shuttled into the ...


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It is a misconception that cats cannot synthesize taurine. Cats can synthesize taurine, just like other mammals, but not enough of it to make up for an entirely taurine-deficient diet. Cats (and other mammalian carnivores) would have consumed a taurine-rich diet in the ancestral environment. It is only when they are fed vegetable/fruit/grain-derived foods ...


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Metabolism ≈ Anabolism + catabolism Metabolism is the set of all chemical reactions happening inside a living body. These reactions can either breaks down big molecules and build up big molecules. The set of reactions the breaks down big molecules is called catabolism. The set of reactions that build up big molecules is called anabolism. Energy Generally ...


2

The dash ("-") does not represent a negative charge or an electron. It simply indicates that the group of atoms ( -OH or -H ) are attached (covalently bonded) to other atoms in a molecule. So they are saying one monomer (molecule) contributes OH to the reaction and the other H. (A charge is indicated by a trailing superscript minus sign.)


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The answer will not satisfy you. The truth is no protein marker will do. On one hand you seem to be looking at some individual, representative protein, which you could measure by immunoblot. But most proteins are in scant concentrations, just as many as required for their job, and go up and down depending on their specific roles, rather than on general ...


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Seemingly the enzyme uses molecular oxygen in the reaction and one of the end products is water. This reaction scheme is more detailed and presumably accurate. http://www.hmdb.ca/reactions/3063 In addition there is also a set of papers detailing coproporphyrinogen oxidase which was also on the website, hopefully one goes into more detail on the reaction. ...


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According to one study: It was calculated that if the excretory percentage of niacin metabolites in the urine were 60%, of the tryptophan ingested, the conversion factor would be a value of 67, meaning that is 67 mg of tryptophan is equal to 1 mg of niacin. However, the study has a pretty low power with only 10 participants and an indirect measure of ...



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