11 Jun Glycogen phosphorylase – releases glucose-1
Question
Glycogen phosphorylase:
releases glucose-1-phosphate from glycogen
is activated by AMP
exists in two forms, phosphorylase a and phosphorylase b
is inhibited by glucose-6-phosphate
all of the above
Use the half reactions and reduction potentials provided below to calculate the ?Go’ of :
malate + NAD+ ? oxaloacetate + NADH + H+
NAD+ + H+ + 2e- ? NADH (Eo’=-0.320V)
oxaloacetate + 2H+ + 2e-? malate (Eo’=-0.175V)
27.98 kJ/mol
-95.52 kJ/mol
95.52 kJ/mol
-27.98 kJ/mol
0.00 kJ/mol
How many net ATP would be produced by glycolysis per glucose molecule in the absence of enolase?
4
1
0
2
At 300 K, the standard free energy for the hydrolysis of ATP to ADP (ATP + H2O —> ADP + Pi) is ?G°? = -31.0 kJ/mol. If the concentration of ATP, ADP and Pi are 1 nM, 0.4 mM and 0.9M, the reaction:
all of these are possible
goes to the left (producing ATP)
is in equilibrium
will never reach equilibrium
goes to the right (producing ADP)
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