The equilbrium constant (Keq) under standard conditions for the hydrolysis of ATP is 200,000 M. This would suggest the reaction is: 1. proceeding in reverse direction 2. proceeding in forward direction 3. in equilibrium However, this does not take into consideration the concentration of substrates/products within the cell. This is can be calculated by determining the reaction quotient, Q by: [ATP] x [Pi] / [ADP] [ATP] + [Pi] / [ADP] [ADP] x [ATP] / [Pi] [ADP] x [Pi] / [ATP] Biochemical reactions commonly involve the transfer of groups from ATP. What is one of the products of pyrophosphate cleavage from ATP? AMP Adenosine ADP Inorganic phosphate Q5-6. The hydrolysis of ATP is often coupled to other reactions. For example: Phosphoenolpyruvate (PEP) + H2O → Pyruvate + Pi (ΔG'° = -63.1 kJ/mol) ATP + H2O → ADP + Pi (ΔG'° = -30.5 kJ/mol) (The standard free-energy changes for the reactions are indicated in brackets) Q5. Given the information above, what is the overall ΔG'° for the following reaction? Phosphoenolpyruvate (PEP) + ADP → Pyruvate + ATP -92.4 kJ/mol -32.6 kJ/mol +32.6 kJ/mol +92.4 kJ/mol +31.4 kJ/mol -31.4 kJ/mol Q6. Coupling reactions to ATP hydrolysis allows exergonic reactions to occur rarely occurs in metabolism shifts the system to equilbrium allows endergonic reactions to occur
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The equilbrium constant (Keq) under standard conditions for the hydrolysis of ATP is 200,000 M. This would suggest the reaction is:
1. proceeding in reverse direction
2. proceeding in forward direction
3. in equilibrium
However, this does not take into consideration the concentration of substrates/products within the cell. This is can be calculated by determining the reaction quotient, Q by:
[ATP] x [Pi] / [ADP]
[ATP] + [Pi] / [ADP]
[ADP] x [ATP] / [Pi]
[ADP] x [Pi] / [ATP]
Biochemical reactions commonly involve the transfer of groups from ATP. What is one of the products of pyrophosphate cleavage from ATP?
AMP
Adenosine
ADP
Inorganic phosphate
Q5-6. The hydrolysis of ATP is often coupled to other reactions. For example:
Phosphoenolpyruvate (PEP) + H2O → Pyruvate + Pi (ΔG'° = -63.1 kJ/mol)
ATP + H2O → ADP + Pi (ΔG'° = -30.5 kJ/mol)
(The standard free-energy changes for the reactions are indicated in brackets)
Q5. Given the information above, what is the overall ΔG'° for the following reaction? Phosphoenolpyruvate (PEP) + ADP → Pyruvate + ATP
-92.4 kJ/mol
-32.6 kJ/mol
+32.6 kJ/mol
+92.4 kJ/mol
+31.4 kJ/mol
-31.4 kJ/mol
Q6. Coupling reactions to ATP hydrolysis
allows exergonic reactions to occur
rarely occurs in
shifts the system to equilbrium
allows endergonic reactions to occur
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