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Flashcards

Plasma Membrane Structure and Functions Q&A

karinateran English 31 cards

Cards in this deck (31)

  1. 1How thick is the plasma membrane?7.5 nm thick
  2. 2Which are the two leaflets of the plasma membrane?Inner leaflet & Outer leaflet
  3. 3Houses Associated Integral.Lipid bilayer
  4. 4The Inner Leaflet faces the _____cytoplasm
  5. 5The Outer LeafletFaces the extracellular environment
  6. 6Examinated by Transmission Electron Microscopy (TEM), the plasma membrane displays __________ structure.A trilaminar (unit membrane) structure.
  7. 7Plasma Membrane Functions (6)1. Envelops the cell & mantains its structural & functional integrity.
    2. Acts as a semipermeable membrane between the cytoplasm & the external environment.
    3. Permits the cell to recognize macromolecules & other cells as well as to be recognized by other cells.
    4. It participates in the transduction of extracellular signals into intracellular events.
    5. Mantains an electrical potential difference between the cytoplasmic & extracellular sides.
    6. It assists in controlling interaction between cells.
  8. 8The lipid bilayer is freely permeable to _____________ but is impermeable to _________.1. small, lipid-soluble, nonpo-
    lar molecules.
    2. charged ions.
  9. 9The lipid bilayer is composed of ______, ______, and _______. Of which, in most cells, __________ constitute the highest percentage.Phospholipids, glycolipids and cholesterol.
    Phospholipids.
  10. 10Phospholipids are _______ molecules, consisting of one polar (_______) head and two nonpolar (________) ____ ___ tails, one of which is usually _________.1. amphipathic
    2. hidrophylic.
    3. hidrophobic.
    fatty acid tails.
    unsaturated.
  11. 11The two leaflets are _____ identical; instead the distribution of the various types of phospholipids is __________.1. not.
    2. asymmetrical.
  12. 12_____________ of each molecule faces the membrane surface, whereas the tails project into the interior of the membrane, facing each other.The polar head.
  13. 13____________ of the two leaflets are mostly 16–18 carbon chain fatty acids, and they form weak _________ bonds that attach the two leaflets to each other.1. the tails.
    2. non covalent.
  14. 14________ are restricted to the extracellular aspect of the outer leaflet. _____ ______ _____ of glycolipids extend from the outer leaflet into the extracellular space and form part of the ________.1. glycolipids.
    2. Polar carbohy-
    drate residues.
    3. glycocalyx.
  15. 15The hydrophobic fatty acyl tails and the polar heads of the phospholipids constitute the _____. Integral proteins are embedded in the lipid bilayer. Peripheral proteins are located primarily on the _______ aspect of the inner leaflet and are attached by ______ interactions to integral proteins.1. LIPID BILAYER
    2.CYTOPLASMIC.
    3. NONCOVALENT.
  16. 16Cholesterol, constituting 2% of _______ lipids, is present in ____ leaflets, and helps maintain the structural integrity of ___________.1. PLAMALEMMA.
    2. BOTH.
    3. THE MEMBRANE.
  17. 17Cholesterol and phospholipids can form microdomains, known as _______, that can affect the movement of integral proteins of the plasmalemma.LIPID RAFTS
  18. 18__________ of the lipid bilayer is crucial to _____, ______, _________, and _________ _________.1. fluidity.
    2. exocytosis, endocytosis, membrane trafficking, and membrane biogenesis.
  19. 19Fluidity increases with _______ temperature and with _______ saturation of the fatty acyl tails.1. INCREASED.
    2. DECREASED.
  20. 20Fluidity __________ with an increase in the membrane’s cholesterol content.DECREASES.
  21. 21__________ include integral proteins and peripheral proteins and, in most cells, constitute approximately 50% of the plasma membrane composition.MEMBRANE PROTEINS.
  22. 22__________ proteins are dissolved in the lipid bilayer.INTEGRAL PROTEINS.
  23. 23______ proteins span the entire thickness of the plasma membrane and may function as membrane receptors, enzymes, cell adhesion molecules, cell recognition proteins, molecules that function in message ______, and _____ proteins.1. TRANSMEMBRANE.
    2. TRANSDUCTION.
    3. TRANSPORT.
  24. 24Most transmembrane proteins are _________.glycoproteins.
  25. 25Transmembrane proteins are ______ and contain _______ and ______ amino acids, some of which interact with the hydrocarbon tails of the mem- brane phospholipids.1. AMPHIPATHIC.
    2. HYDROPHILIC.
    3. HYDROPHOBIC.
  26. 26Most transmembrane proteins are folded so that they pass back and forth across the plasmalemma; therefore, they are also known as _______ proteins.MULTIPASS PROTEINS.
  27. 27_________ proteins may also be anchored to the inner (or occasionally outer) leaflet via fatty acyl or prenyl groups.INTEGRAL.
  28. 28In freeze-fracture preparations, integral proteins remain preferentially attached to the ______, the outer (Protoplasmic FACE) surface of the inner leaflet, rather than the _______ (Extracellular FACE).1. P-face.
    2. E-face.
  29. 29________ proteins do not extend into the lipid bilayer.PERIPHERAL.
  30. 30These proteins are located on the cytoplasmic aspect of the inner leaflet.PHERIPHERAL PROTEINS.
  31. 31The outer leaflets of some cells possess covalently linked glycolipids to which periph- eral proteins are anchored; these peripheral proteins thus project into the __________ space.EXTRACELLULAR SPACE.

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Flashcards on Untitled, created by karinateran on 17/11/2014.
Created by
karinateran · Nov 2014
Updated
Feb 19, 2016
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