Term
| Which of the following is true for all exergonic reactions? |
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Definition
| The reaction proceeds with a net release of free energy. |
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Term
| Chemical equilibrium is relatively rare in living cells. Which of the following could be an example of a reaction at chemical equilibrium in a cell? |
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Definition
| a chemical reaction in which both the reactants and products are only used in a metabolic pathway that is completely inactive |
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Term
| Which of the following shows the correct changes in thermodynamic properties for a chemical reaction in which amino acids are linked to form a protein? |
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Definition
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Term
| When glucose monomers are joined together by glycosidic linkages to form a cellulose polymer, the changes in free energy, total energy, and entropy are as follows: |
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Definition
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Term
| chemical reaction that has a positive ΔG is correctly described as |
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Definition
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Term
| Why is ATP an important molecule in metabolism? |
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Definition
| It provides energy coupling between exergonic and endergonic reactions. |
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Term
| The hydrolysis of ATP to ADP and inorganic phosphate (ATP + H2O → ADP + Pi ) |
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Definition
has a ΔG of about -7 kcal/mol under standard conditions.
involves hydrolysis of a terminal phosphate bond of ATP.
can occur spontaneously under appropriate conditions. |
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Term
| 10,000 molecules of ATP are hydrolyzed to ADP and Pi in a test tube, about twice as much heat is liberated as when a cell hydrolyzes the same amount of ATP. Which of the following is the best explanation for this observation? |
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Definition
| Cells convert some of the energy of ATP hydrolysis into other forms of energy besides heat. |
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Term
| ATP generally energizes a cellular process by |
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Definition
| coupling free energy released by ATP hydrolysis to free energy needed by other reactions. |
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Term
| Which of the following reactions is most likely to be coupled to the reaction ATP + H2O →ADP + Pi (ΔG = -7.3 kcal/mol)? |
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Definition
| E + Pi → EP (ΔG = +5 kcal/mol) |
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