UNE biochem Unit 4 exam Questions
with All Correct Answers 2025-2026
Updated.
Ubiquitination is a means of targeting a protein for which of the following cellular processes? -
Answer Proteasomal degradation
The reaction of ammonia with a-ketoglutarate is catalyzed by_______ and requires ________ as
a reactant? - Answer Glutamate dehydrogenase; NADH or NADPH
Most enzymes involved in a protein digestion require cleavage for activation. These proteins are
secreted as inactive protein forms called: - Answer Zymogens
The urea cycle takes place in which of the following sub cellular locations? - Answer the
cytosol and mitochondria
Which of the following amino acids is considered non essential because its generated by the
urea cycle? - Answer arginine
Which of the following enzymes is regulated by N-acteyl glutamate (NAGs)? - Answer CPS I
Which of the following enzymes is correctly paired with its activator? - Answer N-
acetylglutamate synthase; arginine
Which of the following enzymes will be active in both the fed and fasted state? - Answer
Glutaminase
Which of the following compounds stimulates the synthesis of N-acetylglutamate? - Answer
arginine
Which of the following statements is consistent with nitrogen transport in the fasted state -
Answer Glutaminase will be active
Which of the following is the primary role of glutaminase in the liver? - Answer to free an
amine group from glutamine
in the case of urea cycle deficiency, which of the following amino acids may become essential? -
Answer arginine
, When is the process of autophage most likely occurring in the cell? - Answer When there is
low energy in the cell; ratio of AMP/ATP >1
Unlike many of the other metabolic pathways, the urea cycle can be active under which of the
following conditions? - Answer Both the fed and fasted state
Pepsinogen is activated by which of the following mechanisms or enzymes? - Answer A
change in pH catalyzes the activation of pepsinogen to pepsin
The process of autophagy is defined as which of the following processes? - Answer Recycling
of proteins under conditions of cellular need or starvation
Which of the following enzymes is the regulatory step in the urea cycle? - Answer Carbamoyl
phosphate synthetase (CPSI)
The pancreatic zymogen trypsinogen is activated by which of the following enzymes or
compounds? - Answer Enteropeptidase
Alanine can be shuttled from the skeletal muscle to the liver where it is deaminated by which of
the following enzymes? - Answer Alanine aminotransferase
The primary role of glutamine in the brain is to provide substrate for the synthesis of which of
the following compounds? - Answer Neurotransmitters
In the fed state, which of the following metabolic processes is active? - Answer Hepatic
glycogen synthesis
In the case of an individual in a sedentary lifestyle eating a diet consisting of 50% carbohydrates,
30% protein, and 20% fat, this individual would be in _____ nitrogen balance? - Answer
Neutral
Which of the following will contribute to elevated triglycerides in individuals with type 2
diabetes? - Answer Reduced activity of lipoprotein lipase
Which of the following GLUT transporters facilitates glucose uptake in skeletal muscle? - Answer
GLUT 4
with All Correct Answers 2025-2026
Updated.
Ubiquitination is a means of targeting a protein for which of the following cellular processes? -
Answer Proteasomal degradation
The reaction of ammonia with a-ketoglutarate is catalyzed by_______ and requires ________ as
a reactant? - Answer Glutamate dehydrogenase; NADH or NADPH
Most enzymes involved in a protein digestion require cleavage for activation. These proteins are
secreted as inactive protein forms called: - Answer Zymogens
The urea cycle takes place in which of the following sub cellular locations? - Answer the
cytosol and mitochondria
Which of the following amino acids is considered non essential because its generated by the
urea cycle? - Answer arginine
Which of the following enzymes is regulated by N-acteyl glutamate (NAGs)? - Answer CPS I
Which of the following enzymes is correctly paired with its activator? - Answer N-
acetylglutamate synthase; arginine
Which of the following enzymes will be active in both the fed and fasted state? - Answer
Glutaminase
Which of the following compounds stimulates the synthesis of N-acetylglutamate? - Answer
arginine
Which of the following statements is consistent with nitrogen transport in the fasted state -
Answer Glutaminase will be active
Which of the following is the primary role of glutaminase in the liver? - Answer to free an
amine group from glutamine
in the case of urea cycle deficiency, which of the following amino acids may become essential? -
Answer arginine
, When is the process of autophage most likely occurring in the cell? - Answer When there is
low energy in the cell; ratio of AMP/ATP >1
Unlike many of the other metabolic pathways, the urea cycle can be active under which of the
following conditions? - Answer Both the fed and fasted state
Pepsinogen is activated by which of the following mechanisms or enzymes? - Answer A
change in pH catalyzes the activation of pepsinogen to pepsin
The process of autophagy is defined as which of the following processes? - Answer Recycling
of proteins under conditions of cellular need or starvation
Which of the following enzymes is the regulatory step in the urea cycle? - Answer Carbamoyl
phosphate synthetase (CPSI)
The pancreatic zymogen trypsinogen is activated by which of the following enzymes or
compounds? - Answer Enteropeptidase
Alanine can be shuttled from the skeletal muscle to the liver where it is deaminated by which of
the following enzymes? - Answer Alanine aminotransferase
The primary role of glutamine in the brain is to provide substrate for the synthesis of which of
the following compounds? - Answer Neurotransmitters
In the fed state, which of the following metabolic processes is active? - Answer Hepatic
glycogen synthesis
In the case of an individual in a sedentary lifestyle eating a diet consisting of 50% carbohydrates,
30% protein, and 20% fat, this individual would be in _____ nitrogen balance? - Answer
Neutral
Which of the following will contribute to elevated triglycerides in individuals with type 2
diabetes? - Answer Reduced activity of lipoprotein lipase
Which of the following GLUT transporters facilitates glucose uptake in skeletal muscle? - Answer
GLUT 4
