BCH 403 FINAL ANSWER KEY |
2025 UPDATE | QUESTIONS WITH
COMPLETE SOLUTIONS
Which of the following do not contribute to the favorable thermodynamics of a
phospholipid
bilayer? - Answer-✅Favorable enthalpy resulting from disulfide bond formation
between head groups
In which way are Carboxypeptidase A and trypsin similar? - Answer-✅They both
cleave at a peptide bond.
Substrate level phosphorylation involves transferring a high energy phosphate bond
from
__________. - Answer-✅b. a phosphorylated molecule to ATP
2. __________ are the most common cofactors in dehydrogenase reactions. - Answer-
✅b. NADH/NAD+
3. Metabolic pathways: - Answer-✅a. Always end at a specific molecule.
4. __________ is a bidirectional glucose transporter. - Answer-✅b. GLUT2
5. Under high blood glucose concentrations, __________ effectively traps glucose in
liver cells. - Answer-✅b. Glucokinase
The flow of carbon through glycolysis is largely regulated by the activity of: - Answer-
✅a. Phosphofructokinase-1
The starting point of glycolysis is __________. - Answer-✅a. Glucose
The most important regulated step of gluconeogenesis is: - Answer-✅d. Fructose-1,6-
bisphosphatase
9. The gluconeogenic enzyme found in the endoplasmic reticulum is: - Answer-✅a.
Glucose-6-phosphatase
The __________ is the primary site of gluconeogenesis to raise blood glucose
concentrations. - Answer-✅a. Liver
, 11. Skeletal muscles are __________ of synthesizing glucose from gluconeogenic
intermediates. - Answer-✅b. not capable
12. In glycogenesis, α(1→6) linkages are synthesized by: - Answer-✅c. branching
enzyme.
13. In glycogenolysis, __________ uses a phosphate to cleave α(1→4) linkages. -
Answer-✅b. glycogen phosphorylase.
The two enzymes that directly digest dietary glycogen are __________ and isomaltase.
- Answer-✅a. α-amylase
15. In glycogenesis, almost all α(1→4) linkages are synthesized by: - Answer-✅a.
glycogen synthase.
16. Hexokinase, but not glucokinase, is allosterically regulated by: - Answer-✅d.
Glucose-6-phosphate
17. __________ decreases pyruvate kinase activity and increases the activity of
pyruvate
carboxylase. - Answer-✅a. Acetyl-CoA
18. Fructose-2,6-bisphophate promotes the activation of __________ while inactivating
__________. - Answer-✅c. phosphofructokinase-1; fructose-1,6-bisphosphatase
19. Glycogen phosphorylase a is: - Answer-✅a. Phosphorylated and usually active.
20. Pyruvate dehydrogenase is NOT regulated by: - Answer-✅b. Glucagon
21. The rate-limiting step in the TCA cycle is: - Answer-✅b. Isocitrate dehydrogenase
22. Lactate dehydrogenase in skeletal muscles: - Answer-✅d. Replenishes NAD+ so
that glycolysis can continue to run
23. Pyruvate dehydrogenase complex is found in the __________. - Answer-✅a.
Mitochondria
24. Complex I is a flavoprotein and __________. - Answer-✅b. Iron sulfur protein
25. A metabolic accident leads to 1 electron being transferred onto O2. The resulting
molecule
is: - Answer-✅a. Superoxide (●O2-)
2025 UPDATE | QUESTIONS WITH
COMPLETE SOLUTIONS
Which of the following do not contribute to the favorable thermodynamics of a
phospholipid
bilayer? - Answer-✅Favorable enthalpy resulting from disulfide bond formation
between head groups
In which way are Carboxypeptidase A and trypsin similar? - Answer-✅They both
cleave at a peptide bond.
Substrate level phosphorylation involves transferring a high energy phosphate bond
from
__________. - Answer-✅b. a phosphorylated molecule to ATP
2. __________ are the most common cofactors in dehydrogenase reactions. - Answer-
✅b. NADH/NAD+
3. Metabolic pathways: - Answer-✅a. Always end at a specific molecule.
4. __________ is a bidirectional glucose transporter. - Answer-✅b. GLUT2
5. Under high blood glucose concentrations, __________ effectively traps glucose in
liver cells. - Answer-✅b. Glucokinase
The flow of carbon through glycolysis is largely regulated by the activity of: - Answer-
✅a. Phosphofructokinase-1
The starting point of glycolysis is __________. - Answer-✅a. Glucose
The most important regulated step of gluconeogenesis is: - Answer-✅d. Fructose-1,6-
bisphosphatase
9. The gluconeogenic enzyme found in the endoplasmic reticulum is: - Answer-✅a.
Glucose-6-phosphatase
The __________ is the primary site of gluconeogenesis to raise blood glucose
concentrations. - Answer-✅a. Liver
, 11. Skeletal muscles are __________ of synthesizing glucose from gluconeogenic
intermediates. - Answer-✅b. not capable
12. In glycogenesis, α(1→6) linkages are synthesized by: - Answer-✅c. branching
enzyme.
13. In glycogenolysis, __________ uses a phosphate to cleave α(1→4) linkages. -
Answer-✅b. glycogen phosphorylase.
The two enzymes that directly digest dietary glycogen are __________ and isomaltase.
- Answer-✅a. α-amylase
15. In glycogenesis, almost all α(1→4) linkages are synthesized by: - Answer-✅a.
glycogen synthase.
16. Hexokinase, but not glucokinase, is allosterically regulated by: - Answer-✅d.
Glucose-6-phosphate
17. __________ decreases pyruvate kinase activity and increases the activity of
pyruvate
carboxylase. - Answer-✅a. Acetyl-CoA
18. Fructose-2,6-bisphophate promotes the activation of __________ while inactivating
__________. - Answer-✅c. phosphofructokinase-1; fructose-1,6-bisphosphatase
19. Glycogen phosphorylase a is: - Answer-✅a. Phosphorylated and usually active.
20. Pyruvate dehydrogenase is NOT regulated by: - Answer-✅b. Glucagon
21. The rate-limiting step in the TCA cycle is: - Answer-✅b. Isocitrate dehydrogenase
22. Lactate dehydrogenase in skeletal muscles: - Answer-✅d. Replenishes NAD+ so
that glycolysis can continue to run
23. Pyruvate dehydrogenase complex is found in the __________. - Answer-✅a.
Mitochondria
24. Complex I is a flavoprotein and __________. - Answer-✅b. Iron sulfur protein
25. A metabolic accident leads to 1 electron being transferred onto O2. The resulting
molecule
is: - Answer-✅a. Superoxide (●O2-)
