100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
BIOC 385 Module 5 || with 100% Errorless Answers. CA$18.69   Add to cart
Quickly navigate to
Preview
  2.  
  3. BIOC 385
  4.  
  5. BIOC 385

Exam (elaborations)

BIOC 385 Module 5 || with 100% Errorless Answers.
 6 views  0 purchase
  • Course
  • BIOC 385
  • Institution
  • BIOC 385

The amount of cholesterol in cell membranes varies from ~40% of lipids in the ______________ membrane to ~10% of lipids in the __________________ membranes correct answers The amount of cholesterol in cell membranes varies from ~40% of lipids in the plasma membrane to ~10% of lipids in the endoplas...

[Show more]

Preview 3 out of 21  pages

Document information

  • August 20, 2024
  • 21
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • the amount of cholesterol in cell membranes varies

Written for

  • BIOC 385
  • BIOC 385

Seller

avatar-seller
FullyFocus

Reviews received

Content preview

BIOC 385 Module 5 || with 100% Errorless Answers.
The amount of cholesterol in cell membranes varies from ~40% of lipids in the ______________
membrane to ~10% of lipids in the __________________ membranes correct answers The
amount of cholesterol in cell membranes varies from ~40% of lipids in the plasma membrane to
~10% of lipids in the endoplasmic reticulum membranes

What do high local concentrations of cholesterol do to phospholipids and membrane fluidity?
correct answers prevent lateral movement of phospholipids and decrease membrane fluidity

What feature of cholesterol effects membrane fluidity? correct answers its nonpolar planar rings

At low/high temperatures with more/same/less concentrations, cholesterol maintains membrane
fluidity through its disruption of fatty acid packing. correct answers At low temperatures with
same concentrations, cholesterol maintains membrane fluidity through its disruption of fatty acid
packing.

Most snake venoms contain a _______________ enzyme that causes tissue damage by releasing
free fatty acids from __________________, which function as biological detergents.
a) protein phosphatase A enzyme; triacylglycerols
b) phospholipase A2 enzyme; glycerophospholipids
c) phospholipase A2 enzyme; triacylglycerols
d) protein phosphatase A enzyme' glycerophospholipids correct answers b) phospholipase A2
enzyme; glycerophospholipids

What are the 3 major lipids in cell membranes? correct answers 1) phospholipid
(glycerophospholipids) 2) sphingolipids 3) cholesterol

What are glycerophospholipids derived from? What are the 4 major subtypes of
glycerophospholipids? correct answers derived from phosphatidate;
4 subtypes: phosphatidylcholine, phosphatidylserine, phosphatidylethanolamine,
phosphatidylinositol

What are sphingolipids derived from? What are the 2 major subtypes of sphingolipids? correct
answers derived from sphingosine and 1 fatty acid
2 subtypes: sphingophospholipids (sphingomyelin) and sphingoglycolipids (cerebrosides)

The percentage of lipid types within the membrane lipid fraction is based on what?
a) mass
b) weight
c) density correct answers a) mass

The plasma membrane is mostly protein/lipid in terms of mass and once it is dehydrated. correct
answers The plasma membrane is mostly protein in terms of mass and once it is dehydrated.

,In membrane lipids, where do the polar groups orient towards? Where do the nonpolar tails of
fatty acids, sphingosine, and cholesterol orient towards? correct answers polar - aqueous
environment
nonpolar - hydrophobic center of the lipid bilayer

What do glycerophospholipids contain? correct answers two fatty acids and a phosphate group
attached to glycerol

What do sphingophospholipids contain? correct answers sphingosine and fatty acid which are
attached to a phosphate and choline

What do sphingoclycolipids contain? correct answers sphingosine and fatty acid which are
attached to a glycan group

In comparison with glycerophospholipids. the structure of cerebrosides contains what? correct
answers sphingosine

What does the outer monolayer of the plasma membrane in human erthryocytes contains mostly
what 2 things?
a) phosphatidylcholine and glycerophospholids
b) phosphatidylcholine and sphingolipids
c) phosphatidylphosphate and glycerophospholipids
d) phosphatidylphosphate and spingolipids correct answers b) phosphatidylcholine and
sphingolipids

What does the inner monolayer consist almost entirely of? correct answers glycerophospholipids
(phosphatidylinositol, phosphatidylethanolamine, and phosphatidylserine)

______________ are thought to be discrete membrane regions that contain high concentrations
of cholesterol and an aggregation of transmembrane receptor proteins and glycoproteins involved
in cell signaling correct answers lipid rafts

__________________________ are important sources of fatty acid-derived signaling molecules,
which are released from membrane lipids by hydrolytic cleavage reactions catalyzed by
phospholipase enzymes correct answers glycerophospholipids

What is the simplest glycerophospholipid?
a) phosphatase
b) phosophatidylserine
c) phosphatidylcholine
d) phosphatidate correct answers d) phosphatidate

What are all the very abundant glycerophospholipids? correct answers phosphatidylserine,
phosphatidylcholine, phosphatidylinositol, and phosphatidylethanolamine

, Phospholipase enzymes cleave glycerophospholipids such as PIP2 by catalyzing a
______________ reaction
a) hydrolysis
b) isomerization
c) osmolysis
d) adenlylation correct answers a) hydrolysis

What does cleavage by phospholipase A2 generate? correct answers arachidonate

What does cleavage by phospholipase A1 produce? correct answers stearate

What is the core structure of all sphingolipids and consists of a sphingolipid and a fatty acid?
a) sphingomyelin
b) ganglioside
c) ceramide correct answers c) ceramide

1. __________________ is a sphingophospholipid, whereas 2.____________ is a
monoglycosylated ceramide.
a) 1. ceramide, 2. ganglioside
b) 1. sphingomyelin, 2. cerebroside
c) 1. cerebroside, 2. sphingomyelin
d) 1. sphingomyelin, 2. ganglioside correct answers b) b) 1. sphingomyelin, 2. cerebroside

What is a ceramide with an oligosaccharide moiety?
a) ganglioside
b) sphingomyelin
c) ceramide correct answers a) ganglioside

Sphingoside is synthesized from what 2 things?
a) palmitate and stearate
b) palmitate and proline
c) phosphocholine and stearate
d) proline and stearate correct answers a) palmitate and stearate

Tay-Sachs disease is caused by a defect in the enzyme _____________________. This leads to a
build up of what? correct answers enzyme hexosaminidase A, leading to a buildup of the GM2
ganglioside

Fabry disease is caused by defects in 1.________________________ and the accumulation of
2._____________________
a) 1. hexosaminidase A, 2. GM2 ganglioside
b) 1. sphingomyelinase, 2. GM2 ganglioside
c) 1. alpha-galactosidase A, 2. ceramide trihexoside
d) 1.sphingomyelinase, 2. ceramide trihexoside correct answers c) 1. alpha-galactosidase A, 2.
ceramide trihexoside

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 FullyFocus. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$18.69. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

73243 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
CA$18.69
  • (0)
  Add to cart