Can someone please help me check my answers for this study guide and explain any
ID: 561814 • Letter: C
Question
Can someone please help me check my answers for this study guide and explain anything that's wrong? Thank you!
14. (4 points) When a mixture of 3-phosphoglycerate and 2-phosphoglycerate is incubated at 25 °C with glycerate mutase until equilibrium is reached, the final mixture contains six times.as much 2- phospho hosphoglycerate as 3-phosphoglycerate. Which one of the following statements is most nearly correct, when applied to the reaction as written? (R- 8.315 ]/mol K; T 298 K) C (.os3is) (291) 6) 3-Phosphoglycerate 2-phosphoglycerate A AG is -4.44 kl/mol. B) G"is zero. Gois +12.7 kJ/mol. C) D) 0°is incalculably large and positive. E) &G;"cannot be calculated from the information given. a 0° of-20 kJ/mol at 25° C. Starting under standard conditions, one 15. (4 points) The reaction A + B C has can predict that: A) at equilibrium, the concentration of B will exceed the concentration of A. B) at equilibrium, the concentration of C will be less than the concentration of A. C) at equilibrium, the concentration of C will be much greater than the concentration of A or B. rapidly break down te A+B- when A and B are mixed, the reaction will proceed rapidly toward formation of C. 16. (4 points) The standard free-energy changes for the reactions below are given. AG--43.0 k]/mol &G;":-30.5 kl/mol Phosphocreatine creatine + Pi ATP ADP + Pi What is the overall AG for the following reaction? phosphocreatine + ADP creatine + ATP (-4x, o 30.5) 5 AL-73.5 kJ/mol B) -12.5 kl/mol C) D) E) +12.5 kj/mol +73.5 k]/mol Ge cannot be calculated withoutKeq. 17. (4 points) All of the intermediates in the glycolytic pathway are phosphorylated. List two plausible reasons why this might be advantageous to the cell. Phosphate foues enzyatic ativa tion ener 18. (5 points) Describe one step of glycolysis that is regulated. Include the name of the enzyme and under what conditions the step will proceed faster or slower eoreExplanation / Answer
(14),(15) , (16) and (18) are correct answers
Correct Answer of (17) There are at least three reasons (a) So they will not cross the plasma membrane and be lost.
(b) The resulting high-energy phosphoryl groups can be transferred directly to ADP to make ATP.
(c) The high binding energy of the ionic interactions between the (-) charged phosphoryl groups and (+) charged enzyme side chains helps to stabilize the enzyme-substrate interaction.