. Biochemistry of plants and animals, an introduction. Biochemistry. transketolase ribulose-5P dihydroxyacetone phosphate aldolase. ^ triosephosphate isomerase 3-phospho glycer- aldehyde transketolase sedoheptulose-1, 7-diP -^ADP kinase -^ATP sedoheptulose-7P ribose-5P FIGURE 9-6. An outline (1959) of the transformations of the pentoscphosphate path- way. Except for perhaps the decarboxvlation step, these reactions are probably reversible. The kinase reaction is not reversible of itself, but a phosphatase can convert sedoheptulose-1,7-diphosphate to sedoheptulose-7-phosphate. Since ADP is not
. Biochemistry of plants and animals, an introduction. Biochemistry. transketolase ribulose-5P dihydroxyacetone phosphate aldolase. ^ triosephosphate isomerase 3-phospho glycer- aldehyde transketolase sedoheptulose-1, 7-diP -^ADP kinase -^ATP sedoheptulose-7P ribose-5P FIGURE 9-6. An outline (1959) of the transformations of the pentoscphosphate path- way. Except for perhaps the decarboxvlation step, these reactions are probably reversible. The kinase reaction is not reversible of itself, but a phosphatase can convert sedoheptulose-1,7-diphosphate to sedoheptulose-7-phosphate. Since ADP is not changed to ATP, this stage is not reversible in a strict sense. (TPNH). Hence the energy yield is probably similar by both meta- bolic systems. Undoubtedly both are used, but their relative im- portances are unknown. Obviously the inetabolism of pentoses must at least start with the pentoscphosphate pathway. METABOLISM OF NITROGEN COMPOUNDS Much less is known about the metabolism of nitrogen compounds in plants than about that of carbohydrates. It is not yet possible to write general reaction patterns with any degree of certainty. Neverthe- less, it is possible to discuss certain aspects of nitrogen metabolism from a broad point of view. Solely for convenience in this treatment the subject matter is divided into sections on inorganic and organic nitrogen, respectively. Inorganic Nitrogen The early atmosphere of the earth is believed to have been rich in ammonia. Species then probably depended upon the utilization of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mallette, M. Frank (Manney Frank), 1917-. New York, Wiley
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