Biochem Module 8 Questions and Answers 2025
True or False: The majority of reactions of the urea cycle occur in the cytosol. - ANS-
true
True or False: FADH2 yields 2.5 ATP molecules after donating electrons and hydrogen
atoms to the electron transfer chain (ETC). - ANS-False
True or False: ATP is invested in the urea cycle. - ANS-True
True or False: There are five complexes associated with the ETC. - ANS-False
True or False: In the production of ATP via ATP synthase, the H+ ions move from the
mitochondrial matrix to the intermembrane space. - ANS-False
The urea cycle involves _________ reactions (only those in the cyclic portion of the
process).
-4
-5
-6
-8
- 10 - ANS-- 4
Which amino acids are involved in the urea cycle?
A. Ornithine
B. Aspartate
C. Threonine
D. Both A and B
E. Both A and C - ANS-D. Both A and B
Fumarate reenters the mitochondrion as which of the following molecules?
- Malate
- Ornithine
- Citrulline
- Fumarase
- Ammonia - ANS-- Malate
Urea is useful for excreting nitrogen from cells due to its:
- Ability to hydrogen bond with water
- Ability to form ions
- Large size
, - Low melting point
- None of these - ANS-- Ability to hydrogen bond with water
Which component of the urea cycle is also a member of the CAC?
- Fumarate
- Malate
- Acetyl-CoA
- Citrate
- None of the above - ANS-- Fumarate
Oxidative deamination results in the removal of __________ from amino acids.
A. N2
B. NH4+
C. NO2
D. NH2
E. NH3 - ANS-B. NH4+
The following chemical species is __________. - ANS-Urea
NADH donates electrons and H+ to complex ______.
I
II
III
IV
V - ANS-I
Which of the ETC complexes do pump H+ ions?
Complex I
Complex II
Complex III
Both A and B
Both A and C - ANS-Both A and C
What protein shuttles electrons from Complex III to Complex IV?
- NADH dehydrogenase
- Arginase
- Fumarase
- Cytochrome B
- Cytochrome C - ANS-- Cytochrome C
True or False: The majority of reactions of the urea cycle occur in the cytosol. - ANS-
true
True or False: FADH2 yields 2.5 ATP molecules after donating electrons and hydrogen
atoms to the electron transfer chain (ETC). - ANS-False
True or False: ATP is invested in the urea cycle. - ANS-True
True or False: There are five complexes associated with the ETC. - ANS-False
True or False: In the production of ATP via ATP synthase, the H+ ions move from the
mitochondrial matrix to the intermembrane space. - ANS-False
The urea cycle involves _________ reactions (only those in the cyclic portion of the
process).
-4
-5
-6
-8
- 10 - ANS-- 4
Which amino acids are involved in the urea cycle?
A. Ornithine
B. Aspartate
C. Threonine
D. Both A and B
E. Both A and C - ANS-D. Both A and B
Fumarate reenters the mitochondrion as which of the following molecules?
- Malate
- Ornithine
- Citrulline
- Fumarase
- Ammonia - ANS-- Malate
Urea is useful for excreting nitrogen from cells due to its:
- Ability to hydrogen bond with water
- Ability to form ions
- Large size
, - Low melting point
- None of these - ANS-- Ability to hydrogen bond with water
Which component of the urea cycle is also a member of the CAC?
- Fumarate
- Malate
- Acetyl-CoA
- Citrate
- None of the above - ANS-- Fumarate
Oxidative deamination results in the removal of __________ from amino acids.
A. N2
B. NH4+
C. NO2
D. NH2
E. NH3 - ANS-B. NH4+
The following chemical species is __________. - ANS-Urea
NADH donates electrons and H+ to complex ______.
I
II
III
IV
V - ANS-I
Which of the ETC complexes do pump H+ ions?
Complex I
Complex II
Complex III
Both A and B
Both A and C - ANS-Both A and C
What protein shuttles electrons from Complex III to Complex IV?
- NADH dehydrogenase
- Arginase
- Fumarase
- Cytochrome B
- Cytochrome C - ANS-- Cytochrome C
