WGU C785 OBJECTIVE ASSESSMENT V1 & V2
NEWEST 2026/ 2027 TEST BANK| C785 BIOCHEMISTRY
OA EXAM WITH COMPLETE 300 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS/
ALREADY GRADED A+ (MOST RECENT!!)
C785 OBJECTIVE ASSESSMENT V1.
Which type of inhibition occurs when a particular drug binds to the
active site of an enzyme?
A. Competitive
B. Uncompetitive
C. Irreversible
D. Noncompetitive - Correct Answer - Competitive
Competitive inhibitors compete with the substrate to bind to the active
site of the enzyme.
Salivary amylase, an enzyme responsible for partial digestion of
carbohydrates, has optimum activity at a pH value of 6.8. What is the
impact on the activity if the pH is decreased to 4.0?
A. Significantly increase
B. Significantly decrease
C. Slightly decrease
D. Slightly increase - Correct Answer - Significantly decrease
A drop in pH from 6.8 to 4.0 is a significant change in pH. Recall that
the hydrogen bonds and ionic bonds that hold protein structures together
can be broken by changes in pH. The disruption in protein structure due
to this pH change will also significantly decrease amylase activity.
pg. 1
,Lipase is an enzyme with an optimum temperature of 98.6°F and an
optimum pH of 7.0 in the duodenum in the human body. If a person is
experiencing a fever of 99.8°F, what will increase the activity of the
lipase enzyme?
A. Decrease in temperature
B. Increase in temperature
C. Decrease of the substrate of the enzyme
D. Increase of pH of duodenum to 8.0 - Correct Answer - Decrease in
temperature
An enzyme will have the highest activity when it is under optimal
conditions. In this case, the fever of 99.8 is above the optimal
temperature, so lowering the temperature will increase activity.
The enzyme glucokinase only binds its substrate glucose and converts
glucose into the product glucose-6-phosphate. Which property of
enzymes is described by this scenario?
A. Specificity
B. Activation energy
C. Induced fit
D. Reaction rate - Correct Answer - Specificity
Enzymes have a high degree of specificity. They will bind to one
specific class of molecules and usually catalyze only one type of
reaction.
Low levels of glutathione are associated with neurological,
immunological, and cardiovascular impairments. Two enzymatic
reactions are involved in the synthesis of glutathione. In the second
enzymatic reaction, glutathione synthetase converts glycine to
pg. 2
,glutathione. What would potentially decrease risks associated with low
levels of glutathione?
A. Increasing the amount of glycine in the diet
B. Noncompetitive inhibitor of glutathione synthetase
C. Uncompetitive inhibitor of glutathione synthetase
D. Decreasing the amount of glycine in the diet - Correct Answer -
Increasing the amount of glycine in the diet
One way to increase glutathione levels is to increase the activity of
glutathione synthetase. Glutathione synthetase activity can be increased
by increasing the amount of substrate, or glycine available.
Which class of enzymes impacts protein function by temporarily
removing a phosphate?
A. Kinase
B. Phosphatase
C. Polypeptide
D. Lactase - Correct Answer - Phosphatase
Phosphatases are enzymes that remove phosphate groups from the
substrates.
A final product of a four-step metabolic pathway serves as a
noncompetitive inhibitor, binding to an enzyme in this pathway and
temporarily turning off the pathway. Which enzyme is most likely to be
targeted by the inhibitor?
A. The final enzyme in the pathway
B. The first enzyme in the pathway
C. Any enzyme in the middle of the pathway
pg. 3
, D. The second enzyme in the pathway - Correct Answer - The first
enzyme in the pathway
The final product's structure is more unlike the substrate for the first
enzyme in the pathway than any other, and thus the least likely to fit the
active site of enzyme 1.
A point mutation has altered the amino acid sequence of a neuronal tau
protein, causing serine (Ser) at position 202 to be mutated to proline
(Pro). Which set of codons below corresponds to this mutation?
A. TCT to CCT
B. AGA to GGA
C. CGA to AGG
D. AGG to CCC - Correct Answer - TCT to CCT
TCT is a codon for Ser, and CCT is a codon for Pro. TCT to CCT is a
point mutation that changes Ser to Pro.
Which of the following is required for DNA polymerase to replicate
template DNA in PCR?
A. RNA primers
B. tRNA
C. RNA polymerase
D. DNA primers - Correct Answer - DNA Primers
DNA primers are used in the PCR process.
A portion of the HLA gene and its associated amino acid sequence are
shown below. If cytosine is deleted from codon 101, what will be the
resulting amino acid sequence?
pg. 4
NEWEST 2026/ 2027 TEST BANK| C785 BIOCHEMISTRY
OA EXAM WITH COMPLETE 300 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS/
ALREADY GRADED A+ (MOST RECENT!!)
C785 OBJECTIVE ASSESSMENT V1.
Which type of inhibition occurs when a particular drug binds to the
active site of an enzyme?
A. Competitive
B. Uncompetitive
C. Irreversible
D. Noncompetitive - Correct Answer - Competitive
Competitive inhibitors compete with the substrate to bind to the active
site of the enzyme.
Salivary amylase, an enzyme responsible for partial digestion of
carbohydrates, has optimum activity at a pH value of 6.8. What is the
impact on the activity if the pH is decreased to 4.0?
A. Significantly increase
B. Significantly decrease
C. Slightly decrease
D. Slightly increase - Correct Answer - Significantly decrease
A drop in pH from 6.8 to 4.0 is a significant change in pH. Recall that
the hydrogen bonds and ionic bonds that hold protein structures together
can be broken by changes in pH. The disruption in protein structure due
to this pH change will also significantly decrease amylase activity.
pg. 1
,Lipase is an enzyme with an optimum temperature of 98.6°F and an
optimum pH of 7.0 in the duodenum in the human body. If a person is
experiencing a fever of 99.8°F, what will increase the activity of the
lipase enzyme?
A. Decrease in temperature
B. Increase in temperature
C. Decrease of the substrate of the enzyme
D. Increase of pH of duodenum to 8.0 - Correct Answer - Decrease in
temperature
An enzyme will have the highest activity when it is under optimal
conditions. In this case, the fever of 99.8 is above the optimal
temperature, so lowering the temperature will increase activity.
The enzyme glucokinase only binds its substrate glucose and converts
glucose into the product glucose-6-phosphate. Which property of
enzymes is described by this scenario?
A. Specificity
B. Activation energy
C. Induced fit
D. Reaction rate - Correct Answer - Specificity
Enzymes have a high degree of specificity. They will bind to one
specific class of molecules and usually catalyze only one type of
reaction.
Low levels of glutathione are associated with neurological,
immunological, and cardiovascular impairments. Two enzymatic
reactions are involved in the synthesis of glutathione. In the second
enzymatic reaction, glutathione synthetase converts glycine to
pg. 2
,glutathione. What would potentially decrease risks associated with low
levels of glutathione?
A. Increasing the amount of glycine in the diet
B. Noncompetitive inhibitor of glutathione synthetase
C. Uncompetitive inhibitor of glutathione synthetase
D. Decreasing the amount of glycine in the diet - Correct Answer -
Increasing the amount of glycine in the diet
One way to increase glutathione levels is to increase the activity of
glutathione synthetase. Glutathione synthetase activity can be increased
by increasing the amount of substrate, or glycine available.
Which class of enzymes impacts protein function by temporarily
removing a phosphate?
A. Kinase
B. Phosphatase
C. Polypeptide
D. Lactase - Correct Answer - Phosphatase
Phosphatases are enzymes that remove phosphate groups from the
substrates.
A final product of a four-step metabolic pathway serves as a
noncompetitive inhibitor, binding to an enzyme in this pathway and
temporarily turning off the pathway. Which enzyme is most likely to be
targeted by the inhibitor?
A. The final enzyme in the pathway
B. The first enzyme in the pathway
C. Any enzyme in the middle of the pathway
pg. 3
, D. The second enzyme in the pathway - Correct Answer - The first
enzyme in the pathway
The final product's structure is more unlike the substrate for the first
enzyme in the pathway than any other, and thus the least likely to fit the
active site of enzyme 1.
A point mutation has altered the amino acid sequence of a neuronal tau
protein, causing serine (Ser) at position 202 to be mutated to proline
(Pro). Which set of codons below corresponds to this mutation?
A. TCT to CCT
B. AGA to GGA
C. CGA to AGG
D. AGG to CCC - Correct Answer - TCT to CCT
TCT is a codon for Ser, and CCT is a codon for Pro. TCT to CCT is a
point mutation that changes Ser to Pro.
Which of the following is required for DNA polymerase to replicate
template DNA in PCR?
A. RNA primers
B. tRNA
C. RNA polymerase
D. DNA primers - Correct Answer - DNA Primers
DNA primers are used in the PCR process.
A portion of the HLA gene and its associated amino acid sequence are
shown below. If cytosine is deleted from codon 101, what will be the
resulting amino acid sequence?
pg. 4
