How does membrane formation occur? correct answer: decrease in ionic bond with water
What are the main functions of the cell membrane? correct answer: - barrier regulating the import and export of essential molecules
- Compartmentalization of specialized processes increases cellular efficienc...
BCH210 Lecture 7 Questions With
Complete Solions
How does membrane formation occur? correct answer: decrease
in ionic bond with water
What are the main functions of the cell membrane? correct
answer: - barrier regulating the import and export of essential
molecules
- Compartmentalization of specialized processes increases
cellular efficiency.
- modulates cell-cell recognition due to the presence of
glycoproteins and glycolipids.
- Signalling across the membrane is mediated by proteins and
lipids.
What is the fluid mosaic model? correct answer: Fluid' -
membrane components can move quite rapidly in the plane of
the membrane.
'Mosaic' - diverse mixture of lipids, proteins and carbohydrates
What are recent modifications made to the fluid mosaic model?
correct answer: the movement of lipid and membrane proteins
differs significant in samples of pure lipids vs. biological
membranes.
Why are biological membranes describe as asymmetrical?
correct answer: - The two leaflets of the membrane have very
different lipid and protein compositions.
, - addition of sugars to lipids and proteins is a form of post-
translational modification mediated by enzymes and is important
for membrane insertion and cell recognition.
- The movement of lipids from one leaflet to the other is very
slow.
- Flip-flow diffusion of polar/charged groups across the
hydrophobic membrane interior is energetically unfavorable.
Why is the movement of lipids from one leaflet to the other is
very slow? correct answer: because of the presence of the polar
head group
What mediates membrane asymmetry? correct answer: enzymes
Enzymes that mediate membrane asymmetry correct answer:
Flippase
Floppase
Scramblase
What does flippase do? correct answer: - moves PE and PS
from outer to inner cytosolic leaflet
- ATP dependent
What does floppase do? correct answer: - moves phospholipids
from cytosolic to outer leaflet
- ATP dependent
What does scramblase do? correct answer: - moves lipids in
either direction, toward equilibrium
-moves lipids down their concentration gradient
- ATP independent
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 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 Classroom. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £10.66. You're not tied to anything after your purchase.
