BCH210 Term Test #2| 171 Questions| With Complete Solutions
8 keer bekeken 0 keer verkocht
Vak
BCH210
Instelling
University Of Toronto (U Of T
)
Membranes (both outside and inside the cell) correct answer: Not a static structure, very important for cell function. They contain proteins that are very complex and vital to cell life.
Mitochondria membranes correct answer: Very vital for the cell, has both an inner and outer membrane.
Wh...
BCH210 Term Test #2| 171 Questions|
With Complete Solutions
Membranes (both outside and inside the cell) correct answer:
Not a static structure, very important for cell function. They
contain proteins that are very complex and vital to cell life.
Mitochondria membranes correct answer: Very vital for the
cell, has both an inner and outer membrane.
What drives membrane formation? correct answer: A decrease
in ionic interactions with water / limiting the hydrophobic
interactions drives membrane formation.
Lipid tails are ... correct answer: Hydrophobic
How membrane formation increase entropy? correct answer:
The hydrophobic parts no longer interact with the hydrophilic
parts, which allows them to increase entropy.
What does the cell membrane do? correct answer: Acts as a
barrier regulating the import and export of essential molecules.
Compartmentalization increases cellular efficiency. Cell-cell
recognition, and signaling are all important processes of the
membrane.
,Glycolipids / glycoproteins. correct answer: Sugars attached to
lipids / proteins on the outside of the cell.
Signaling across the membrane correct answer: Involves a
ligand binding to the receptor which causes something to happen
inside the cell.
Biological bilayers are impermeable to correct answer: Polar
molecules
What interactions happen between lipid tails correct answer:
The hydrophobic effect, van der waals.
Membranes are asymmetric correct answer: Different lipids on
either side, glycoproteins/lipids only on the outside, different
compositions on either leaflet.
Leaflet correct answer: One half of a lipid bilayer
Membrane fluidity correct answer: Proteins and lipids can
diffuse laterally, but flip-flop occurs selectively.
What process is vital in crossing the bilayer correct answer:
Conformational change
What plays a role in fluidity (move + change structure)? correct
answer: Lipids and cholesterol
Fluid mosaic model of cell membrane correct answer: Fluid =
movement (laterally), Mosaic = mixture of different
components.
, Amendment to the fluid mosaic model correct answer: Not as
fluid as we once thought, certain molecules are limited to certain
domains. We see restricted movement in live cells vs
experimental conditions.
Asymmetry in the bilayer correct answer: We see different
lipids, and proteins. Specific interactions depends on what is
present. Lipids move across the plane but rarely flip-flop due to
hydrophobic inner core.
Is flip flop diffusion favorable? correct answer: No
Post-translational modification correct answer: Creates
glycolipids and glycoproteins, this is done by transferases. These
are important for protein folding and membrane insertion.
Enzymes in membrane asymmetry correct answer: Uses ATP
Flippase: moves into cytosolic leaflet (PE, PS)
Floppase: moves to the outer leaflet
Doesn't need ATP
Scramblase: moves down [ ] gradient, lowers asymmetry of
membrane.
These are all translocases!!
Where do membrane proteins get their orientation correct
answer: ER
How to measure lateral diffusion correct answer: FRAP
(fluorescence recovery after photobleaching) - tag certain
Voordelen van het kopen van samenvattingen bij Stuvia op een rij:
Verzekerd van kwaliteit door reviews
Stuvia-klanten hebben meer dan 700.000 samenvattingen beoordeeld. Zo weet je zeker dat je de beste documenten koopt!
Snel en makkelijk kopen
Je betaalt supersnel en eenmalig met iDeal, creditcard of Stuvia-tegoed voor de samenvatting. Zonder lidmaatschap.
Focus op de essentie
Samenvattingen worden geschreven voor en door anderen. Daarom zijn de samenvattingen altijd betrouwbaar en actueel. Zo kom je snel tot de kern!
Veelgestelde vragen
Wat krijg ik als ik dit document koop?
Je krijgt een PDF, die direct beschikbaar is na je aankoop. Het gekochte document is altijd, overal en oneindig toegankelijk via je profiel.
Tevredenheidsgarantie: hoe werkt dat?
Onze tevredenheidsgarantie zorgt ervoor dat je altijd een studiedocument vindt dat goed bij je past. Je vult een formulier in en onze klantenservice regelt de rest.
Van wie koop ik deze samenvatting?
Stuvia is een marktplaats, je koop dit document dus niet van ons, maar van verkoper Classroom. Stuvia faciliteert de betaling aan de verkoper.
Zit ik meteen vast aan een abonnement?
Nee, je koopt alleen deze samenvatting voor €14,61. Je zit daarna nergens aan vast.
