Biochemistry
6th Edition
ISBN: 9781305577206
Author: Reginald H. Garrett, Charles M. Grisham
Publisher: Cengage Learning
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Chapter 21, Problem 13P
Interpretation Introduction
To propose:
The reaction for the conversion to glycerate 3 p from phosphoglycolate by the photorespiration reaction.
Introduction:
The pathway of photorespiration is not coupled with the transferred electrons and it do not generate ATP and do not use oxygen. It uses the primary fuel of sugar phosphate and also produces carbon di oxide.
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The high phosphoryl transfer potential of 1,3-bisphosphoglycerate is explained by the resonance stability of the product, 3-phosphoglycerate. The same explanation applies to the reaction that generates resonance stabilized pyruvate from phosphoenolpyruvate. Show the resonance structures for both products, 3-phosphoglycerate and pyruvate, and state why the reactant in both reactions is not resonance stabilized.
The mechanism involved in the reaction catalyzed by phosphoglyceromutase is known to involve a phosphorylatedenzyme intermediate. If 3-phosphoglycerate is radioactively labeledwith 32P, the product of the reaction, 2-phosphoglycerate, does nothave any radioactive label. Design a mechanism to explain these facts.
Consider the malate dehydrogenase reaction from the citric acid cycle. Given the listed concentrations, calculate the free energy
change for this reaction at energy change for this reaction at 37.0 °C (310 K). AG' for the reaction is +29.7 kJ/mol. Assume that
the reaction occurs at pH 7.
[malate]
1.25 mM
[oxaloacetate] = 0.290 mM
[NAD+] = 430 mM
[NADH] :
= 170 mM
AG :
kJ-mol-1
* TOOLS
x10
Chapter 21 Solutions
Biochemistry
Ch. 21 - P700* Has the Most Negative Standard Reduction...Ch. 21 - Prob. 2PCh. 21 - Prob. 3PCh. 21 - Prob. 4PCh. 21 - The Relative Efficiency of ATP Synthesis in...Ch. 21 - pH and in the Chloroplast Proton-Motive Force...Ch. 21 - Prob. 7PCh. 21 - Prob. 8PCh. 21 - Prob. 9PCh. 21 - Prob. 10P
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