BCH 403 3rd Exam Questions
The tricarboxylic acid (TCA, Kreb's, Citric Acid) cycle generates one FADH2 per cycle. The correct order of
electron flow from this FADH2 to O2 is:
a. Complex I → Complex II → Complex III → Complex IV → Complex V → O2
b. Complex I → CoQ → Complex III → Cyt C → Complex IV → O2
c. Complex II → CoQ → Complex III → Cyt C → Complex IV → O2
d. Complex I → Cyt C → Complex III → CoQ → Complex IV → O2
e. Complex II → Cyt C → Complex III → CoQ → Complex IV → O2 - correct answer ✔✔c. Complex II →
CoQ → Complex III → Cyt C → Complex IV → O2
Glucose is primarily synthesized in:
a. Liver
b. Kidney cortex - correct answer ✔✔a. Liver
Fructose-2,6-bisphosphate:
a. Allosterically activates phosphofructokinase-1 by preventing allosteric inhibitors from binding to the
enzyme.
b. Allosterically inactivates phosphofructokinase-1 by promoting allosteric inhibitors binding to the
enzyme.
, c. Allosterically activates fructose-2,6-bisphosphatase by preventing allosteric inhibitors from binding to
the enzyme.
d. Allosterically inactivates fructose-2,6-bisphosphatase by promoting allosteric inhibitors binding to the
enzyme.
e. Allosterically activates phosphofructokinase-2 by preventing allosteric inhibitors from binding to the
enzyme. - correct answer ✔✔a. Allosterically activates phosphofructokinase-1 by preventing allosteric
inhibitors from binding to the enzyme.
In the liver, electrons from cytoplasmic NADH are transported into the mitochondria via:
a. Glycerol-3-phosphate shuttle
b. Malate/Aspartate shuttle - correct answer ✔✔b. Malate/Aspartate shuttle
__________ is the most important regulatory enzyme of gluconeogenesis.
a. Fructose-1,6-bisphosphatase
b. Fructose-2,6-bisphosphatase
c. Phosphofructokinase-1
d. Phosphofructokinase-2
e. Glucose-6-phosphatase - correct answer ✔✔a. Fructose-1,6-bisphosphatase
The regulated step of glycolysis that generates ATP is:
The tricarboxylic acid (TCA, Kreb's, Citric Acid) cycle generates one FADH2 per cycle. The correct order of
electron flow from this FADH2 to O2 is:
a. Complex I → Complex II → Complex III → Complex IV → Complex V → O2
b. Complex I → CoQ → Complex III → Cyt C → Complex IV → O2
c. Complex II → CoQ → Complex III → Cyt C → Complex IV → O2
d. Complex I → Cyt C → Complex III → CoQ → Complex IV → O2
e. Complex II → Cyt C → Complex III → CoQ → Complex IV → O2 - correct answer ✔✔c. Complex II →
CoQ → Complex III → Cyt C → Complex IV → O2
Glucose is primarily synthesized in:
a. Liver
b. Kidney cortex - correct answer ✔✔a. Liver
Fructose-2,6-bisphosphate:
a. Allosterically activates phosphofructokinase-1 by preventing allosteric inhibitors from binding to the
enzyme.
b. Allosterically inactivates phosphofructokinase-1 by promoting allosteric inhibitors binding to the
enzyme.
, c. Allosterically activates fructose-2,6-bisphosphatase by preventing allosteric inhibitors from binding to
the enzyme.
d. Allosterically inactivates fructose-2,6-bisphosphatase by promoting allosteric inhibitors binding to the
enzyme.
e. Allosterically activates phosphofructokinase-2 by preventing allosteric inhibitors from binding to the
enzyme. - correct answer ✔✔a. Allosterically activates phosphofructokinase-1 by preventing allosteric
inhibitors from binding to the enzyme.
In the liver, electrons from cytoplasmic NADH are transported into the mitochondria via:
a. Glycerol-3-phosphate shuttle
b. Malate/Aspartate shuttle - correct answer ✔✔b. Malate/Aspartate shuttle
__________ is the most important regulatory enzyme of gluconeogenesis.
a. Fructose-1,6-bisphosphatase
b. Fructose-2,6-bisphosphatase
c. Phosphofructokinase-1
d. Phosphofructokinase-2
e. Glucose-6-phosphatase - correct answer ✔✔a. Fructose-1,6-bisphosphatase
The regulated step of glycolysis that generates ATP is:
