PURINE AND PYRIMIDINE BIOSYNTHESIS

PURINE AND PYRIMIDINE BIOSYNTHESIS - cycle is an example...

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PURINE AND PYRIMIDINE BIOSYNTHESIS DNA and RNA consist of linked strands of building blocks called nucleotides. Each nucleotide  contains a nitrogenous base (a purine or a pyrimidine) , a pentose (5-carbon) sugar, and a  phosphate group. Purines Pyrimidines Adenine Cytosine Guanine Thymine Uracil Carbon and nitrogen atoms are taken from certain amino acids to form the purine and pyrimidine  rings. The energy for synthesis comes from ATP.    INTEGRATION OF ANABOLISM/CATABOLISM Amphibolic pathway—this is one that functions in both anabolism and catabolism. The Kreb’s 
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Unformatted text preview: cycle is an example. Not only does it involve the breakdown of glucose, intermediates can be drawn out and used in synthesis reactions. Energy stores of a cell can affect the rates of biochemical reactions. If ATP begins to accumulate, an enzyme shuts down glycolysis. If the Kreb’s cycle needs to increase its rate, either to provide more ATP or to provide more intermediates for anabolic pathways, glycolysis accelerates to meet the demand....
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