BIOCHEM MIDTERM EXAM WITH
100% CORRECT ANSWERS 2026
Denaturation occurs in the stomach with gastric juice as the
denaturant. correct answer The first step in protein digestion is
denaturation. Where does denaturation occur in the body, and
what is the denaturant?
Gastric juice correct answer What is the first digestive enzyme
that protein encounters, and where does this encounter take
place?
urea cycle correct answer the metabolic pathway that converts
ammonium ions into urea. This cycle processes the ammonium
ions in the form of carbamoyl phosphate
carbamoyl phosphate correct answer a compound formed from
CO2, NH4, ATP, and H2O
carbamoyl phosphate correct answer In what chemical form do
ammonium ions enter the urea cycle?
one molecule of bicarbonate, two molecules of MgATP, and one
molecule of glutamine. correct answer What are the chemical
reactants for the formation of carbamoyl phosphate?
, arginine, ornithine and citrulline correct answer Name the
three amino acids are involved as intermediates in the urea
cycle..
carbamoyl phosphate correct answer What substance is the
"fuel" for the urea cycle?
Four correct answer How much energy, in terms of ATP, is
expended in the synthesis of a molecule of urea?
One nitrogen atom comes from carbamoyl phosphate, the other
from aspartate. correct answer What are the sources of the
two nitrogen atoms in urea?
Arginine correct answer the most nitrogen-rich of the standard
amino acids. It contains four nitrogen atoms.
nonstandard amino acids correct answer amino acids not
found in protein.
False; glutamate to a-ketoglutarate. correct answer TRUE OR
FALSE
The toxicity of ammonium ion is related to the oxidative
deamination reaction by which it is formed, the conversion of
aspartate to a-ketoglutarate.
100% CORRECT ANSWERS 2026
Denaturation occurs in the stomach with gastric juice as the
denaturant. correct answer The first step in protein digestion is
denaturation. Where does denaturation occur in the body, and
what is the denaturant?
Gastric juice correct answer What is the first digestive enzyme
that protein encounters, and where does this encounter take
place?
urea cycle correct answer the metabolic pathway that converts
ammonium ions into urea. This cycle processes the ammonium
ions in the form of carbamoyl phosphate
carbamoyl phosphate correct answer a compound formed from
CO2, NH4, ATP, and H2O
carbamoyl phosphate correct answer In what chemical form do
ammonium ions enter the urea cycle?
one molecule of bicarbonate, two molecules of MgATP, and one
molecule of glutamine. correct answer What are the chemical
reactants for the formation of carbamoyl phosphate?
, arginine, ornithine and citrulline correct answer Name the
three amino acids are involved as intermediates in the urea
cycle..
carbamoyl phosphate correct answer What substance is the
"fuel" for the urea cycle?
Four correct answer How much energy, in terms of ATP, is
expended in the synthesis of a molecule of urea?
One nitrogen atom comes from carbamoyl phosphate, the other
from aspartate. correct answer What are the sources of the
two nitrogen atoms in urea?
Arginine correct answer the most nitrogen-rich of the standard
amino acids. It contains four nitrogen atoms.
nonstandard amino acids correct answer amino acids not
found in protein.
False; glutamate to a-ketoglutarate. correct answer TRUE OR
FALSE
The toxicity of ammonium ion is related to the oxidative
deamination reaction by which it is formed, the conversion of
aspartate to a-ketoglutarate.
