Exam (elaborations)
BIOC 385 Exam 2 Questions & Detailed Answers
- Course
- BIOC 385
- Institution
- North Dakota State University
BIOC 385 Exam 2 Questions & Detailed Answers
[Show more]
Content preview
BIOC 385 Exam 2 Questions & Detailed AnswersGlycogen - ANS Which glucose homopolymer would be used if a person had to
sprint quickly?
Glycogen synthesis - ANS Gluconeogenesis would most likely be allosterically
activated simultaneously along with which other metabolic process?
Glucagon - ANS Which hormone slows down glycolysis while stimulating
gluconeogenesis through the phosphorylation of phosphofructokinase 2 (PFK2)
and fructose-2,6-bisphosphatase?
NADP+ - ANS What molecule activates the pentose phosphate pathway?
activated by ATP energy - ANS In the reaction catalyzed by pyruvate carboxylase
(the first reaction in gluconeogenesis), CO2 is
0; 2 - ANS Starting from the oxidative phase of the pentose phosphate pathway,
how many ATP and high-energy reduced molecules, respectively, are made in
going from one glucose molecule to glyceraldehyde-3-phosphate and fructose-6-
phosphate?
glycerol - ANS Which of the following metabolites has carbon atoms that can end
up in glucose via the gluconeogenesis pathway in humans?
,increase; glycolysis - ANS The hormone insulin activates phosphofructokinase 2
(2PFK2). This leads to a(n) __________ in concentration of fructose 2,6
bisphosphate, which favors the __________ pathway.
It provides a source of NADH for gluconeogenesis via malate transport. - ANS
Which correctly describes the role of the transport system shown below?
Glucose is not exported from muscle cells because muscle cells lack glucose-6-
phosphatase. - ANS How does glycogen metabolism regulation differ between liver
cells and muscle cells?
Muscle cells store glycogen for its own energy needs and not the needs of other
tissues. - ANS Why is it important that muscle cells are unresponsive to glucagon?
serve as the origin of the glycogen polymer. - ANS The role of glycogenin is to
glycogen synthase; glycogen phosphorylase; decrease - ANS The hormone insulin
stimulates __________ and inhibits __________, leading to a(n) __________ in the
glucose levels.
C-4 - ANS In the elongation of glycogen, activated glucose units are attached to
which hydroxyl of the terminal residue of the growing glycogen chain?
a) [Pi]/[glucose 1-phosphate] = 3.5/1
, b) The concentration of glucose 1-phosphate is below the equilibrium value.
Therefore, the rate of glucose 1-phosphate removal (through entry into glycolysis)
is greater than the rate at which glucose 1-phosphate is produced by glycogen
phosphorylase, so metabolite flow is from glycogen to glucose 1-phosphate. - ANS
Glycogen phosphorylase catalyzes the removal of glucose from glycogen. The ΔGo'
for this reaction is 3.1 kJ/mol.
a) Calculate the ratio of [Pi] to [glucose 1-phosphate] when the reaction is at
equilibrium at 298K. (Hint: the removal of glucose units from glycogen does not
change the glycogen concentration.)
b) In muscle cells under physiological conditions, the measured ratio of
[Pi]/[glucose 1-phosphate] is more than 100:1. What does this indicate about the
direction of metabolite flow through the glycogen phosphorylase reaction in
muscle?
Choose one answer for part a and one answer for part b.
UDP - ANS In the glycogenesis pathway, what is the leaving group in the last step
where glucose is added to the growing glycogen chain?
Perilipin - ANS Which of the following proteins is activated by phosphorylation
during glucagon-activated fatty acid release from adipocytes?
adrenaline - ANS Because muscles lack receptors for glucagon, what hormone
activates muscle glycogen phosphorylase?
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 Schoolflix. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $15.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
73216 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now