BIOC 385 Exam 3 All Questions with complete
solutions
1. In the duodenum, enter peptidase C)arginine
. stimulates
the
A) cleaves chymotrypsin to form activity of
chymotrypsin carbonyl
B) neutralizes the pH of the duodenum to a phosphate
pH of 7 synthetas
C)cleaves trypsinogen to form trypsin eI
D) generates peptides and amino acids D) arginine
stimulates
2. Which of the three proteins in the
the
ubiquination pathway is the most
production
responsible for recognizing the
of the al-
ubiquintated target protein?
losteric
activator N-
E1
acetylgluta
E2
mate
E3
all three of the proteins recognize the
target pro- tein
3. What is the regulatory mechanism by
which argi- nine stimulates flux through
the urea cycle?
A) arginine stimulates flux through the
urea cycle by inhibiting the enzyme
nitrogenase
B) arginine stimulates the production of N-
acetyl- glutamate which activates
arginase
1/
157
,BIOC 385 Exam 3 All Questions with complete
solutions
C) cleaves trypsinogen to form trypsin
D) arginine stimulates
the pro- duction of the
E3
allosteric activa- tor N-
acetylglutamate
4. oxidation of homogentisate
2/
157
,BIOC 385 Exam 3 All Questions with complete
solutions
A person who has alkaptonuria is easily
diagnosed from their black urine. What
causes the black col- or?
reduction of acetoacetyl-CoA
phenylpyruvate and
phenylacetate oxidation of
homogentisate oxidation of
phenylalanine
a) metabolic pathways
5. The twenty amino acids needed for to syn- thesize essential
protein syn- thesis can be categorized in amino acids require
animals as essential or nonessential with many enzymes
regard to dietary sources.
a)What is a characteristic of the biosynthetic path- b) arginase does
not generate
ways needed to generate essential amino enough arginine in the urea
acids? cy- cle to support protein
b) Why is arginine an essential amino acid synthe- sis
even though it is generated by arginase c) tyrosine is generated
in the urea cycle? from
c) Why is tyrosine a nonessential amino acid in an- phenylalanine, which
is an es-
imals even though they do not contain protein
shikimate pathway enzymes? synthesis
c)tyrosine
a) metabolic pathways to synthesize is
essential amino acids require many synthesized
enzymes de novo by
b) arginase does not generate enough the same
arginine in the urea cycle to support enzymes
3/
157
, BIOC 385 Exam 3 All Questions with complete
solutions
that synthesize alanine and pyruvate sential amino acid in animals
a) metabolic pathways to synthesize
essen- tial amino acids require NADPH;
pathways for
nonessential amino acid pathways require
NADH
b) arginase does not generate enough
arginine in
4/
157
solutions
1. In the duodenum, enter peptidase C)arginine
. stimulates
the
A) cleaves chymotrypsin to form activity of
chymotrypsin carbonyl
B) neutralizes the pH of the duodenum to a phosphate
pH of 7 synthetas
C)cleaves trypsinogen to form trypsin eI
D) generates peptides and amino acids D) arginine
stimulates
2. Which of the three proteins in the
the
ubiquination pathway is the most
production
responsible for recognizing the
of the al-
ubiquintated target protein?
losteric
activator N-
E1
acetylgluta
E2
mate
E3
all three of the proteins recognize the
target pro- tein
3. What is the regulatory mechanism by
which argi- nine stimulates flux through
the urea cycle?
A) arginine stimulates flux through the
urea cycle by inhibiting the enzyme
nitrogenase
B) arginine stimulates the production of N-
acetyl- glutamate which activates
arginase
1/
157
,BIOC 385 Exam 3 All Questions with complete
solutions
C) cleaves trypsinogen to form trypsin
D) arginine stimulates
the pro- duction of the
E3
allosteric activa- tor N-
acetylglutamate
4. oxidation of homogentisate
2/
157
,BIOC 385 Exam 3 All Questions with complete
solutions
A person who has alkaptonuria is easily
diagnosed from their black urine. What
causes the black col- or?
reduction of acetoacetyl-CoA
phenylpyruvate and
phenylacetate oxidation of
homogentisate oxidation of
phenylalanine
a) metabolic pathways
5. The twenty amino acids needed for to syn- thesize essential
protein syn- thesis can be categorized in amino acids require
animals as essential or nonessential with many enzymes
regard to dietary sources.
a)What is a characteristic of the biosynthetic path- b) arginase does
not generate
ways needed to generate essential amino enough arginine in the urea
acids? cy- cle to support protein
b) Why is arginine an essential amino acid synthe- sis
even though it is generated by arginase c) tyrosine is generated
in the urea cycle? from
c) Why is tyrosine a nonessential amino acid in an- phenylalanine, which
is an es-
imals even though they do not contain protein
shikimate pathway enzymes? synthesis
c)tyrosine
a) metabolic pathways to synthesize is
essential amino acids require many synthesized
enzymes de novo by
b) arginase does not generate enough the same
arginine in the urea cycle to support enzymes
3/
157
, BIOC 385 Exam 3 All Questions with complete
solutions
that synthesize alanine and pyruvate sential amino acid in animals
a) metabolic pathways to synthesize
essen- tial amino acids require NADPH;
pathways for
nonessential amino acid pathways require
NADH
b) arginase does not generate enough
arginine in
4/
157
