Coupled Reactions - AP Chemistry
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What is the role of enzymes in coupled reactions?
What is the role of enzymes in coupled reactions?
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Enzymes lower activation energy, facilitating coupling. Enzymes catalyze both reactions in the coupling mechanism.
Enzymes lower activation energy, facilitating coupling. Enzymes catalyze both reactions in the coupling mechanism.
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How do coupled reactions occur in cells?
How do coupled reactions occur in cells?
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They occur via shared intermediates, like ATP. Common molecules like ATP connect energy-releasing and energy-requiring reactions.
They occur via shared intermediates, like ATP. Common molecules like ATP connect energy-releasing and energy-requiring reactions.
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What is the primary function of ATP in metabolism?
What is the primary function of ATP in metabolism?
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To transfer energy via phosphate group transfer. Phosphorylation provides energy for cellular work and biosynthesis.
To transfer energy via phosphate group transfer. Phosphorylation provides energy for cellular work and biosynthesis.
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Identify the intermediate formed during ATP hydrolysis.
Identify the intermediate formed during ATP hydrolysis.
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ADP and inorganic phosphate (Pᵢ). These products carry energy and participate in further reactions.
ADP and inorganic phosphate (Pᵢ). These products carry energy and participate in further reactions.
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What occurs to ATP in a coupled reaction?
What occurs to ATP in a coupled reaction?
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It is hydrolyzed to ADP and Pᵢ. ATP breakdown releases energy for the coupled process.
It is hydrolyzed to ADP and Pᵢ. ATP breakdown releases energy for the coupled process.
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What is ΔG in the context of coupled reactions?
What is ΔG in the context of coupled reactions?
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Change in Gibbs free energy. Measures energy available for useful work in reactions.
Change in Gibbs free energy. Measures energy available for useful work in reactions.
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What is a phosphorylated intermediate?
What is a phosphorylated intermediate?
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A substrate with added phosphate group from ATP. Activated molecules have increased reactivity for subsequent steps.
A substrate with added phosphate group from ATP. Activated molecules have increased reactivity for subsequent steps.
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What is the energy currency of the cell?
What is the energy currency of the cell?
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ATP. ATP stores and transfers energy throughout the cell.
ATP. ATP stores and transfers energy throughout the cell.
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Which reaction type is driven by ATP hydrolysis?
Which reaction type is driven by ATP hydrolysis?
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Endergonic reactions. ATP provides energy for non-spontaneous biosynthetic processes.
Endergonic reactions. ATP provides energy for non-spontaneous biosynthetic processes.
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Identify a common cellular process that involves coupled reactions.
Identify a common cellular process that involves coupled reactions.
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Muscle contraction. ATP hydrolysis provides energy for protein conformational changes.
Muscle contraction. ATP hydrolysis provides energy for protein conformational changes.
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How is energy transferred in a coupled reaction?
How is energy transferred in a coupled reaction?
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Via transfer of phosphoryl groups or electrons. Chemical groups carry energy between reaction sites.
Via transfer of phosphoryl groups or electrons. Chemical groups carry energy between reaction sites.
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What does 'exergonic' mean in terms of Gibbs free energy?
What does 'exergonic' mean in terms of Gibbs free energy?
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Exergonic reactions have a negative ΔG. Reactions release energy and occur spontaneously.
Exergonic reactions have a negative ΔG. Reactions release energy and occur spontaneously.
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Identify the role of ATP in coupled reactions.
Identify the role of ATP in coupled reactions.
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ATP acts as an energy carrier linking reactions. ATP transfers energy by releasing phosphate groups to drive reactions.
ATP acts as an energy carrier linking reactions. ATP transfers energy by releasing phosphate groups to drive reactions.
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State the relationship between Gibbs free energy and spontaneity.
State the relationship between Gibbs free energy and spontaneity.
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Negative ΔG indicates spontaneous reaction. Thermodynamic favorability determines if reactions proceed without input.
Negative ΔG indicates spontaneous reaction. Thermodynamic favorability determines if reactions proceed without input.
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Which type of reaction is ATP hydrolysis?
Which type of reaction is ATP hydrolysis?
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Exergonic reaction. ATP hydrolysis releases energy spontaneously with negative $\Delta G$.
Exergonic reaction. ATP hydrolysis releases energy spontaneously with negative $\Delta G$.
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What does ATP stand for?
What does ATP stand for?
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Adenosine Triphosphate. Universal energy currency with three phosphate groups.
Adenosine Triphosphate. Universal energy currency with three phosphate groups.
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How does ATP provide energy to endergonic reactions?
How does ATP provide energy to endergonic reactions?
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By phosphorylating substrates, making them more reactive. Phosphate transfer activates molecules for subsequent reactions.
By phosphorylating substrates, making them more reactive. Phosphate transfer activates molecules for subsequent reactions.
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What happens to Gibbs free energy in endergonic reactions?
What happens to Gibbs free energy in endergonic reactions?
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It increases. Energy is absorbed to form less stable products.
It increases. Energy is absorbed to form less stable products.
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What happens to Gibbs free energy in exergonic reactions?
What happens to Gibbs free energy in exergonic reactions?
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It decreases. Energy is released as the system becomes more stable.
It decreases. Energy is released as the system becomes more stable.
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What is the role of coupled reactions in metabolism?
What is the role of coupled reactions in metabolism?
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They facilitate biosynthesis and cellular work. Energy coupling drives essential cellular functions efficiently.
They facilitate biosynthesis and cellular work. Energy coupling drives essential cellular functions efficiently.
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Which molecule is regenerated in coupled reactions involving ATP?
Which molecule is regenerated in coupled reactions involving ATP?
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ADP is phosphorylated back to ATP. ATP is regenerated from ADP through phosphorylation reactions.
ADP is phosphorylated back to ATP. ATP is regenerated from ADP through phosphorylation reactions.
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How does ATP hydrolysis affect reaction equilibrium?
How does ATP hydrolysis affect reaction equilibrium?
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It shifts equilibrium towards product formation. Energy release drives reactions toward completion.
It shifts equilibrium towards product formation. Energy release drives reactions toward completion.
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What does coupled reaction enable in cellular processes?
What does coupled reaction enable in cellular processes?
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Efficient energy use. Coupling minimizes energy waste in cellular processes.
Efficient energy use. Coupling minimizes energy waste in cellular processes.
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Identify a reaction that is often coupled with ATP hydrolysis.
Identify a reaction that is often coupled with ATP hydrolysis.
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Protein synthesis. Translation requires ATP hydrolysis for amino acid assembly.
Protein synthesis. Translation requires ATP hydrolysis for amino acid assembly.
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State the equation for ATP hydrolysis.
State the equation for ATP hydrolysis.
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ATP + H₂O → ADP + Pᵢ + energy. Hydrolysis breaks ATP bonds, releasing energy for cellular processes.
ATP + H₂O → ADP + Pᵢ + energy. Hydrolysis breaks ATP bonds, releasing energy for cellular processes.
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Identify the process that uses ATP to power cellular work.
Identify the process that uses ATP to power cellular work.
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Mechanical work like muscle contraction. ATP hydrolysis powers myosin movement along actin filaments.
Mechanical work like muscle contraction. ATP hydrolysis powers myosin movement along actin filaments.
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What is the effect of ATP hydrolysis on reaction spontaneity?
What is the effect of ATP hydrolysis on reaction spontaneity?
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It makes non-spontaneous reactions spontaneous. Energy coupling makes thermodynamically unfavorable reactions proceed.
It makes non-spontaneous reactions spontaneous. Energy coupling makes thermodynamically unfavorable reactions proceed.
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Identify a process where ATP synthesis is coupled to another reaction.
Identify a process where ATP synthesis is coupled to another reaction.
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Oxidative phosphorylation. ATP synthesis is coupled to electron transport chain energy.
Oxidative phosphorylation. ATP synthesis is coupled to electron transport chain energy.
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Which molecule often acts as a common intermediate in coupled reactions?
Which molecule often acts as a common intermediate in coupled reactions?
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ATP. ATP connects exergonic and endergonic processes in metabolism.
ATP. ATP connects exergonic and endergonic processes in metabolism.
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Identify a common example of a coupled reaction in metabolism.
Identify a common example of a coupled reaction in metabolism.
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Glucose phosphorylation during glycolysis. ATP hydrolysis drives glucose activation in the first glycolytic step.
Glucose phosphorylation during glycolysis. ATP hydrolysis drives glucose activation in the first glycolytic step.
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