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WGU C785 Biochemistry Exam | Questions with 100% Correct Answers
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WGU C785 Biochemistry Exam | Questions with 100% Correct Answers
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WGU C785 Biochemistry Exam |Questions with 100% Correct
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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.
Low levels of glutathione are associated with certain types of ovarian and breast
cancers. In the synthesis of glutathione, glutathione accumulates in the cell,
binding to an enzyme in the pathway and temporarily preventing the synthesis
of glutathione. Which type of inhibition is described by this scenario?
Feedback
Competitive
Allosteric
Uncompetitive - ✔ ✔ Feedback
The keywords here are that glutathione accumulates and binds to an enzyme in
the pathway to prevent synthesis. Feedback inhibition occurs when a product of
a pathway turns into an inhibitor of an enzyme earlier in the pathway.
,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?
Decrease in temperature
Increase in temperature
Decrease of the substrate of the enzyme
Increase of pH of duodenum to 8.0 - ✔ ✔ 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?
Specificity
Activation energy
,Induced fit
Reaction rate - ✔ ✔ 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 glutathione. What would potentially decrease risks associated
with low levels of glutathione?
Increasing the amount of glycine in the diet
Noncompetitive inhibitor of glutathione synthetase
Uncompetitive inhibitor of glutathione synthetase
Decreasing the amount of glycine in the diet - ✔ ✔ 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?
Kinase
Phosphatase
Polypeptide
Lactase - ✔ ✔ Phosphatase
Phosphatases are enzymes that remove phosphate groups from the substrates.
How does the activation energy of enzyme-catalyzed reactions compare to those
of corresponding uncatalyzed reactions?
The activation energy of enzyme-catalyzed reactions are the same as uncatalyzed
reactions
The activation energy of the enzyme-catalyzed reactions only changes in response
to temperature.
The activation energy of enzyme-catalyzed reactions are lower than
the uncatalyzed reaction
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