Portage Biochemistry Module 8 Exam Study
Questions with Verified Answers
What is the "unifying" theory covered in this module? - Answer Chemiosmotic theory
How many ATP are produced per NADH molecule? Per FADH2 molecule? - Answer NADH- 2.5 ATP
FADH2- 1.5 ATP
In the figure below, several portions of a molecule have dashed circles. Which portion of the molecule,
A, B, C, or D, would be removed in oxidative deamination? Briefly explain. - Answer Part D. This is the
amine portion of the amino acid.
What happens to the carbon skeleton of an amino acid after it is separated from NH4+? - Answer The
carbon skeleton becomes acetyl-CoA, then ATP.
Why is urea such a good molecule for excreting nitrogen from cells? - Answer It has a high density of
nitrogen in a small molecule, and it can form numerous hydrogen bonds with water.
A. In the overall processing of NH4+, how many molecules of ATP are invested?
B. What molecule from the urea cycle can enter the citric acid cycle?
C. What is Pi?
D. Which two amino acids were studied in Module 3? - Answer A. 3 ATP molecules, overall. 2 ATP from
Reaction-A and 1 in Reaction-2.
B. Fumarate
C. Inorganic phosphate or inorganic orthophosphate.
D. Aspartate and arginine were studied in Module 3.
What is an integral protein? - Answer A protein firmly embedded in the lipid bilayer
How many complexes are in the ETC? - Answer Four complexes named complex I, II, III, and IV
, At which ETC complex is H2O produced? How is it produced? - Answer At complex IV by the following
reaction:
O2 + 4e- + 4H+ → 2H2O
What complex oxidizes NADH?
How about FADH2? - Answer Complex I for NADH.
Complex II for FADH2.
At which complex is water produced from oxygen? - Answer Complex IV
How is the H+ gradient formed? - Answer Complexes I, III, and IV pump these ions from the matrix to the
intermembrane space.
What is the purpose of FO and F1 in ATP synthase? - Answer FO contains the pore through which H+
ions flow causing its rotation. The rotation of FO causes F1 to catalyze the formation of ATP from ADP
and Pi.
True or False: The majority of reactions of the urea cycle occur in the mitochondrial matrix. - Answer
False
True or False: NADH yields 2.5 ATP molecules after donating electrons and hydrogen atoms to the
electron transfer chain (ETC). - Answer True
True or False: ATP is invested in the urea cycle. - Answer True
True or False: There are four complexes associated with the ETC. - Answer True
True or False: In the production of ATP via ATP synthase, the H+ ions move from the mitochondrial
matrix to the intermembrane space. - Answer False
Questions with Verified Answers
What is the "unifying" theory covered in this module? - Answer Chemiosmotic theory
How many ATP are produced per NADH molecule? Per FADH2 molecule? - Answer NADH- 2.5 ATP
FADH2- 1.5 ATP
In the figure below, several portions of a molecule have dashed circles. Which portion of the molecule,
A, B, C, or D, would be removed in oxidative deamination? Briefly explain. - Answer Part D. This is the
amine portion of the amino acid.
What happens to the carbon skeleton of an amino acid after it is separated from NH4+? - Answer The
carbon skeleton becomes acetyl-CoA, then ATP.
Why is urea such a good molecule for excreting nitrogen from cells? - Answer It has a high density of
nitrogen in a small molecule, and it can form numerous hydrogen bonds with water.
A. In the overall processing of NH4+, how many molecules of ATP are invested?
B. What molecule from the urea cycle can enter the citric acid cycle?
C. What is Pi?
D. Which two amino acids were studied in Module 3? - Answer A. 3 ATP molecules, overall. 2 ATP from
Reaction-A and 1 in Reaction-2.
B. Fumarate
C. Inorganic phosphate or inorganic orthophosphate.
D. Aspartate and arginine were studied in Module 3.
What is an integral protein? - Answer A protein firmly embedded in the lipid bilayer
How many complexes are in the ETC? - Answer Four complexes named complex I, II, III, and IV
, At which ETC complex is H2O produced? How is it produced? - Answer At complex IV by the following
reaction:
O2 + 4e- + 4H+ → 2H2O
What complex oxidizes NADH?
How about FADH2? - Answer Complex I for NADH.
Complex II for FADH2.
At which complex is water produced from oxygen? - Answer Complex IV
How is the H+ gradient formed? - Answer Complexes I, III, and IV pump these ions from the matrix to the
intermembrane space.
What is the purpose of FO and F1 in ATP synthase? - Answer FO contains the pore through which H+
ions flow causing its rotation. The rotation of FO causes F1 to catalyze the formation of ATP from ADP
and Pi.
True or False: The majority of reactions of the urea cycle occur in the mitochondrial matrix. - Answer
False
True or False: NADH yields 2.5 ATP molecules after donating electrons and hydrogen atoms to the
electron transfer chain (ETC). - Answer True
True or False: ATP is invested in the urea cycle. - Answer True
True or False: There are four complexes associated with the ETC. - Answer True
True or False: In the production of ATP via ATP synthase, the H+ ions move from the mitochondrial
matrix to the intermembrane space. - Answer False
