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FINAL STUDY GUIDE
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10
Biology
05/06/2010

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Term
Which of the following is true for all exergonic reactions?
Definition
The reaction proceeds with a net release of free energy.
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?
Definition
a chemical reaction in which both the reactants and products are only used in a metabolic pathway that is completely inactive
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?
Definition
+ΔH, -ΔS, +ΔG
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:
Definition
+ΔG, +ΔH, -ΔS
Term
chemical reaction that has a positive ΔG is correctly described as
Definition
endergonic
Term
Why is ATP an important molecule in metabolism?
Definition
It provides energy coupling between exergonic and endergonic reactions.
Term
The hydrolysis of ATP to ADP and inorganic phosphate (ATP + H2O → ADP + Pi )
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.
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?
Definition
Cells convert some of the energy of ATP hydrolysis into other forms of energy besides heat.
Term
ATP generally energizes a cellular process by
Definition
coupling free energy released by ATP hydrolysis to free energy needed by other reactions.
Term
Which of the following reactions is most likely to be coupled to the reaction ATP + H2O →ADP + Pi (ΔG = -7.3 kcal/mol)?
Definition
E + Pi → EP (ΔG = +5 kcal/mol)