Exam (elaborations)
Test Bank - Lehninger Principles of Biochemistry, 7th, and 8th Edition by Nelson, All Chapters
- Course
- Institution
- Book
Test Bank - Lehninger Principles of Biochemistry, 7th, and 8th Edition by Nelson, All Chapters
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
TEST BANK FOR LEHNINGER PRINCIPLES OF BIOCHEMISTRY 8TH EDITION BY DAVID L. NELSON||ISBN NO:9781319228002||COMPLETE GUIDE A+||LATEST UPDATE 2024 EXAM WITH ACTUAL QUESTIONS AND COMPLETE 100%CORRECT ANSW...
-
Test Bank for Lehninger Principles of Biochemistry 8th Edition by David L. Nelson 9781319228002 Complete Guide A+ 2024.
-
Test Bank for Lehninger Principles of Biochemistry, 8th Edition by David L. Nelson All Chapters Complete Guide With Complete Solution 2024-2025
Seller
Follow
phinta004
Reviews received
Content preview
Test Bank - Lehninger Principles of Biochemistry, 7th, and 8thEdition by Nelson, All Chapters
Glycogen is converted to monosaccharide units by:
A) glucokinase.
B) glucose-6-phosphatase
C) glycogen phosphorylase.
D) glycogen synthase.
E) glycogenase. - ANSWER: C) glycogen phosphorylase.
The glycogen-branching enzyme catalyzes:
A) degradation of (α1 → 4) linkages in glycogen
B) formation of (α1 → 4) linkages in glycogen.
C) formation of (α1 → 6) linkages during glycogen synthesis.
D) glycogen degradation in tree branches.
E) removal of unneeded glucose residues at the ends of branches. - ANSWER: C) formation of (α1 → 6)
linkages during glycogen synthesis.
Glycogenin:
A) catalyzes the conversion of starch into glycogen.
B) is the enzyme responsible for forming branches in glycogen.
C) is the gene that encodes glycogen synthase.
D) is the primer on which new glycogen chains are initiated.
E) regulates the synthesis of glycogen. - ANSWER: D) is the primer on which new glycogen chains are
initiated.
Which of the following is true of glycogen synthase?
A) Activation of the enzyme involves a phosphorylation.
B) It catalyzes addition of glucose residues to the nonreducing end of a glycogen chain by formation
of (α1 → 4) bonds.
C) It uses glucose-6-phosphate as donor of glucose units
D) The conversion of an active to an inactive form of the enzyme is controlled by the concentration
of cAMP.
E) The enzyme has measurable activity only in liver. - ANSWER: B) It catalyzes addition of glucose
residues to the nonreducing end of a glycogen chain by formation
of (α1 → 4) bonds.
Which one of the following statements abour mammalian glycogen synthase is not correct?
A) It is especially predominant in liver and muscle.
B) The donor molecule is a sugar nucleotide.
C) The phosphorylated form of this enzyme is inactive.
D) This enzyme adds glucose units to the nonreducing end of glycogen branches.
E) This enzyme adds the initial glucose unit to a tyrosine residue in glycogenin. - ANSWER: E) This
enzyme adds the initial glucose unit to a tyrosine residue in glycogenin.
The enzyme glycogen phosphorylase:
A) catalyzes a cleavage of β (1 → 4) bonds.
B) catalyzes a hydrolytic cleavage of (α1 → 4) bonds.
C) is a substrate for a kinase.
, D) uses glucose 6-phosphate as a substrate.
E) uses glucose as a substrate. - ANSWER: B) catalyzes a hydrolytic cleavage of (α1 → 4) bonds.
Aside from maintaining the integrity of its hereditary material, the most important general metabolic
concern of a cell is:
A) keeping its glucose levels high.
B) maintaining a constant supply and concentration of ATP.
C) preserving its ability to carry out oxidative phosphorylation.
D) protecting its enzymes from rapid degradation.
E) running all its major metabolic pathways at maximum efficiency. - ANSWER: B) maintaining a
constant supply and concentration of ATP.
If the mass action ratio, Q, for a reaction under cellular conditions is larger than the equilibrium
constant, Keq, then:
A) the reaction will be at equilibrium.
B) the reaction will go backward and be endergonic.
C) the reaction will go backward and be exergonic.
D) the reaction will go forward and be endergonic.
E) the reaction will go forward and be exergonic. - ANSWER: C) the reaction will go backward and be
exergonic.
Which one of the following types of mechanisms is not known to play a role in the reversible
alteration of enzyme activity?
A) Activation by cleavage of an inactive zymogen
B) Allosteric response to a regulatory molecule
C) Alteration of the synthesis or degradation rate of an enzyme
D) Covalent modification of the enzyme
E) Interactions between catalytic and regulatory subunits - ANSWER: A) Activation by cleavage of an
inactive zymogen
Pages: 575-576 Difficulty: 2 Ans: D
Gluconeogenesis must use "bypass reactions" to circumvent three reactions in the glycolytic pathway
that are highly exergonic and essentially irreversible. Reactions carried out by which three of the
enzymes listed must be bypassed in the gluconeogenic pathway?
1) Hexokinase
2) Phosphoglycerate kinase
3) Phosphofructokinase-1
4) Pyruvate kinase
5) Triosephosphate isomerase
A) 1, 2, 3
B) 1, 2, 4
C) 1, 4, 5
D) 1, 3, 4
E) 2, 3, 4 - ANSWER: D) 1, 3, 4
Cellular isozymes of pyruvate kinase are allosterically inhibited by:
A) high concentrations of AMP.
B) high concentrations of ATP.
C) high concentrations of citrate.
D) low concentrations of acetyl-CoA.
E) low concentrations of ATP. - ANSWER: B) high concentrations of ATP.
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 phinta004. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75323 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now