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10 Cards in this Set

  • Front
  • Back
Which statement about the role of pyridoxal-phosphate in
the mechanism of action of phosphorylase is correct?
A. It acts as a general acid-base catalyst.
B. It orients the glycogen substrate in the active site.
C. It binds water at the active site.
D. It interacts with an allosteric site.
E. It donates a proton to the O-4 of the departing glycogen
A. It acts as a general acid-base catalyst.
In the electron-transport chain, which two-electron carrier transfers to one-electron carriers?
A. Heme A
B. iron-sulfur proteins
D. ubiquinol
E. Cytochrome C
D. ubiquinol
Which component increases glycogen degradation by directly activating phosphorylase kinase?
A. Ca++
D. Adenylate cyclase
E. Glycogen synthase
A. Ca++
Which of the following would not result from an increase in
epinephrine levels?
A. An increase in glycogen degradation
B. phosphorylation of glycogen synthase
C. phosphorylation of protein kinase A
D. inactivation of protein phosphatase 1
E. All of the above
C. phosphorylation of protein kinase A
How would glycogen synthase kinase 3 affect glycogen syn-
thase function?
A. Increase the binding affinity for glucose-6-P
B. Decrease the bindinfg affinity for UDP-glucose
C. increase the rate of addition of glucose molecules to glycogen
D. increase the Vmax of glycogen synthase
E. None of the above
B. Decrease the bindinfg affinity for UDP-glucose
Which of the following statements is (are) true?
I) Protein kinase promotes glycogen synthesis by activating phosphorylase kinase;

II) glycogen synthesis is regulated in part by glucose-6-P levels

III) glucagon promotes glycogen synthesis

IV) phosphorylation by protein kinase b of glycogen synthase kinase 3 activates glycogen synthesis

A. II only
B. II and III
C. II and IV
D. I only
E. I, II and IV
F. III only
C. II and IV
________binds to the _______ subunits of protein kinase A, releasing the ____ subunits, which are now enzymatically _______.
A. Ca++, catalytic, regulatory, active
B. AMP, regulatory, catalytic, active
C. cAMP, regulatory, catalytic, active
D. ATP, catalytic, regulatory, inactive
E. cAMP, catalytic, regulatory, active
C. cAMP, regulatory, catalytic, active
Place the following respiratory-chain components in their proper sequence with the first one having the lowest reduction potential.
A. NADH-Q reductase, ubiquinone, cytochrome C reductase, cytochrome c, cytochrome c oxidase
B. NADH-Q reductase, cytochrome c, ubiquinone, cy-
tochrome C reductase, cytochrome c oxidase
C. ubiquinone, NADH-Q reductase, cytochrome C reduc-
tase, cytochrome c, cytochrome c oxidase
D. NADH-Q reductase, ubiquinone, cytochrome c oxidase,
cytochrome c, cytochrome C reductase
E. cytochrome c, NADH-Q reductase, cytochrome c oxi-
dase, ubiquinone, cytochrome C reductase
A. NADH-Q reductase, ubiquinone, cytochrome C reductase, cytochrome c, cytochrome c oxidase
Cytosolic NADH electrons can be transported into the mi-
tochondrion via the glycerol phosphate shuttle. Identify the mitochondrial oxidant receiving the electrons in this process.
A. ketoglutarate
D. oxaloacetate
F. malate
The equation for the reduction of pyruvate by FADH2 is as follows:
Pyruvate + FADH2 -> Lactate + FAD

For pyruvate/lactate, E=-185 mV and for FAD/FADH2, E=-
5 mV. Calculate the _G for the reaction (Faraday constant
F = 96.485 kJ/mol/V).
A. +34.7 kJ/mol
B. -34.7 kJ/mol
C. -36.7 kJ/mol
D. -18.4 kJ/mol
E. +36.7 kJ/mol
A. +34.7 kJ/mol