Portage Biochemistry Exam Answered
Questions (Limited) Latest 2026-2027
True or False: The majority of reactions of the urea cycle
occur in the mitochondrial matrix. - Correct Answers
✅False
True or False: NADH yields 2.5 ATP molecules after donating
electrons and hydrogen atoms to the electron transfer chain
(ETC). - Correct Answers ✅True
True or False: ATP is invested in the urea cycle. - Correct
Answers ✅True
True or False: There are four complexes associated with the
ETC. - Correct Answers ✅True
True or False: In the production of ATP via ATP synthase, the
H+ ions move from the mitochondrial matrix to the
intermembrane space. - Correct Answers ✅False
The urea cycle involves _________ reactions (only those in the
cyclic portion of the process). - Correct Answers ✅4
Which amino acids are involved in the urea cycle? - Correct
Answers ✅ornithine, asparate, arginine
Fumarate reenters the mitochondrion as which of the
following molecules? - Correct Answers ✅malate
, Portage Biochemistry Exam Answered
Questions (Limited) Latest 2026-2027
Urea is useful for excreting nitrogen from cells due to its: -
Correct Answers ✅high density of nitrogen atoms, water
solubility
Which component of the urea cycle is also a member of the
CAC? - Correct Answers ✅fumurate
Oxidative deamination of an amino acid results in a carbon
skeleton and the formation of __________. - Correct Answers
✅NH4+
The following chemical species is __________.
NH4+ - Correct Answers ✅ammonium
NADH donates electrons and H+ to complex ______. - Correct
Answers ✅1
Which of the ETC complexes do pump H+ ions? - Correct
Answers ✅complex 1, 3, 4
What protein shuttles electrons from Complex III to Complex
IV? - Correct Answers ✅cytochrome c
Questions (Limited) Latest 2026-2027
True or False: The majority of reactions of the urea cycle
occur in the mitochondrial matrix. - Correct Answers
✅False
True or False: NADH yields 2.5 ATP molecules after donating
electrons and hydrogen atoms to the electron transfer chain
(ETC). - Correct Answers ✅True
True or False: ATP is invested in the urea cycle. - Correct
Answers ✅True
True or False: There are four complexes associated with the
ETC. - Correct Answers ✅True
True or False: In the production of ATP via ATP synthase, the
H+ ions move from the mitochondrial matrix to the
intermembrane space. - Correct Answers ✅False
The urea cycle involves _________ reactions (only those in the
cyclic portion of the process). - Correct Answers ✅4
Which amino acids are involved in the urea cycle? - Correct
Answers ✅ornithine, asparate, arginine
Fumarate reenters the mitochondrion as which of the
following molecules? - Correct Answers ✅malate
, Portage Biochemistry Exam Answered
Questions (Limited) Latest 2026-2027
Urea is useful for excreting nitrogen from cells due to its: -
Correct Answers ✅high density of nitrogen atoms, water
solubility
Which component of the urea cycle is also a member of the
CAC? - Correct Answers ✅fumurate
Oxidative deamination of an amino acid results in a carbon
skeleton and the formation of __________. - Correct Answers
✅NH4+
The following chemical species is __________.
NH4+ - Correct Answers ✅ammonium
NADH donates electrons and H+ to complex ______. - Correct
Answers ✅1
Which of the ETC complexes do pump H+ ions? - Correct
Answers ✅complex 1, 3, 4
What protein shuttles electrons from Complex III to Complex
IV? - Correct Answers ✅cytochrome c
