Problem set 1 Reaction 1: C6H12O6 + 6O2 ? 6H2O + 6CO2 1. Is ?G positive or negative for this reaction? Explain your answer. Look to see what is happening in the reaction – is something complex being broken down into simpler things (which gives off energy), or are simpler things being put together into more complex molecules (which requires energy). ?G is a negative reaction 2. Is this reaction exergonic or endergonic? (Remember that if ?G < 0, then the reaction is exergonic and spontaneous, and if ?G > 0, then the reaction is endergonic and not spontaneous) Explain your answer. 3. Is this reaction spontaneous? Reaction 2: 6CO2 + 6H2O ? C6H12O6 + 6O2 1. Is ?G positive or negative? 2. Is this reaction exergonic or endergonic? 3. Is this reaction spontaneous?
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This process releases energy, which means it is exergonic. Since exergonic reactions have a negative change in Gibbs free energy ($\Delta G$), we can conclude that: $$\Delta G_1 < 0$$ Now, let's analyze Reaction 2: $$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + Show more…
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Many biochemical reactions have positive values for $\Delta G^{\circ}$ and seemingly should not be expected to be spontaneous. They occur, however, because they are chemically coupled with other reactions that have negative values of $\Delta G^{\circ}$. An example is the set of reactions that forms the beginning part of the sequence of reactions involved in the metabolism of glucose, a sugar. Given these reactions and their corresponding $\Delta G^{\circ}$ values, $$ \begin{array}{r} \text { glucose }+\mathrm{PO}_{4}^{3-} \longrightarrow \text { glucose } 6 \text { -phosphate }+\mathrm{H}_{2} \mathrm{O} \\ \Delta G^{\circ}=+13.13 \mathrm{~kJ} \end{array} $$ calculate $\Delta G^{\circ}$ for the coupled reaction glucose $+\mathrm{ATP} \longrightarrow$ glucose 6 -phosphate $+\mathrm{ADP}$
The respiration of 1 mole of glucose is represented by the following equation: C6H12O6 + 6O2 → 6CO2 + 6H2O + 686 Kcal Graph this reaction on the grid provided. You only have the left side energy, so estimate the reactants and products' energy (they do not have to be numerically accurate, but they have to be placed on the graph to indicate if the reaction is endergonic or exergonic). The graph must include: · Labels for X and Y axis · Reactants (from equation) · Activation energy · Products (from equation) · ΔG = -686 · This reaction is mediated by many enzymes in the cells. Draw a dotted line to represent any difference in the graph as a result of enzyme action. A. Is this an endergonic or exergonic reaction? Explain why you selected your answer choice. B. Where is the energy that is released or absorbed (depends on the reaction) found? C. How does an enzyme speed up a reaction? Use the graph to explain your answer.
Madhur L.
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