Exam (elaborations)
WGU C785 Biochemistry Exam | Questions with 100% Correct Answers
- Course
- Institution
WGU C785 Biochemistry Exam | Questions with 100% Correct Answers
[Show more]
Content preview
WGU C785 Biochemistry Exam |Questions with 100% Correct
Answers
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Examsplug. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
62890 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now