Question

A phosphorus-containing anion is removed from ATP in its conversion to cyclic AMP, as shown in Figure $28.3 .$ The anion is often abbreviated as $\mathrm{PP}_{i} .$ Which of the following anions is represented by $\mathrm{PP}_{i}$ ? (a) $\mathrm{P}_{3} \mathrm{O}_{10}{ }^{5-}$ (b) $\mathrm{P}_{2} \mathrm{O}_{7}^{4-}$ (c) $\mathrm{PO}_{4}^{3-}$ (d) $\mathrm{H}_{2} \mathrm{PO}_{4}^{-}$

Name: Problem 5, Chapter 28: Fundamentals of General, Organic, and Biological Chemistry
Uploaded: 2022-01-07T17:31:29-08:00
Duration: 2 min 36 s
Channel: Ramesh Singh
Description: A phosphorus-containing anion is removed from ATP in its conversion to cyclic AMP, as shown in Figure 28.3 . The anion is often abbreviated as PPi . Which of the following anions is represented by PPi ? (a) P3 O10 ^5- (b) P2 O7^4- (c) PO4^3- (d) H2 PO4^-

   A phosphorus-containing anion is removed from ATP in its conversion to cyclic AMP, as shown in Figure $28.3 .$ The anion is often abbreviated as $\mathrm{PP}_{i} .$ Which of the following anions is represented by $\mathrm{PP}_{i}$ ?
(a) $\mathrm{P}_{3} \mathrm{O}_{10}{ }^{5-}$
(b) $\mathrm{P}_{2} \mathrm{O}_{7}^{4-}$
(c) $\mathrm{PO}_{4}^{3-}$
(d) $\mathrm{H}_{2} \mathrm{PO}_{4}^{-}$

Fundamentals of General, Organic, and Biological Chemistry

John McMurry, David… 1st Edition

Chapter 28, Problem 5

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Solved by Expert Ramesh Singh

01/07/2022

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Step 1: The question is asking us to identify the anion represented by $\mathrm{PP}_{i}$ which is formed during the conversion of ATP to cyclic AMP. Show more…

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A phosphorus-containing anion is removed from ATP in its conversion to cyclic AMP, as shown in Figure $28.3 .$ The anion is often abbreviated as $\mathrm{PP}_{i} .$ Which of the following anions is represented by $\mathrm{PP}_{i}$ ? (a) $\mathrm{P}_{3} \mathrm{O}_{10}{ }^{5-}$ (b) $\mathrm{P}_{2} \mathrm{O}_{7}^{4-}$ (c) $\mathrm{PO}_{4}^{3-}$ (d) $\mathrm{H}_{2} \mathrm{PO}_{4}^{-}$

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Key Concepts

Pyrophosphate (PPi)

Pyrophosphate, abbreviated as PPi, is a diphosphate anion composed of two phosphate groups linked by a high-energy phosphoanhydride bond. It is produced during certain ATP-dependent reactions and has the chemical composition P2O7^4-, making it distinct from other phosphate ions.

ATP Hydrolysis

ATP hydrolysis is a fundamental biochemical process where ATP is broken down to release energy. This reaction often involves the cleavage of phosphoanhydride bonds, producing products such as cyclic AMP and inorganic phosphate-containing anions, which are central to cellular signaling and energy transfer.

Chemical Formula Interpretation

Understanding chemical formula notation is key in distinguishing between different anions. Recognizing the number of phosphorus and oxygen atoms, as well as the overall charge on the ion, allows one to clearly identify compounds like pyrophosphate (P2O7^4-) in contrast to other phosphate species.

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