Inhibition of ATCase by a ________ nucleotide and activation of ATCase by a ________ nucleotide keep the balance of purine and pyrimidine pools in E.coli.

Question

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Inhibition of ATCase by a pyrimidine nucleotide (CTP) and activation of ATCase by a purine nucleotide (ATP) keeps the balance of purine and pyrimidine pools in E.coli. This is most clearly represented by choice C since it includes a pyrimidine nucleotide as the inhibitor and a purine nucleotide (ATP) as the activator. The other choices either include two purine nucleotides or a single pyrimidine nucleotide as both the inhibitor and activator, which does not maintain the balance of purine and pyrimidine pools.

Inhibition of ATCase by a ________ Nucleotide and Activation of ATCase