Ap bio mini test one.txt

Card Set Information

Ap bio mini test one.txt
2010-09-23 17:28:44
Ap bio Membrane structure function cell reproduction organelles

Ap bio
Show Answers:

  1. What kind of molecule is a phospholipid?
    An amphipathic molecule meaning it has a hydrophobic region and hyrdopphilic.
  2. What's the fluid mosaic model?
    The membrane is a fluid structure wirh varioys proteins embedded in or attached to a double layer of phospholipids.
  3. Davson danielli model
    Sandwhiched phoshoplipid bilayer betweenb two protein layers. WRONG
  4. Current fluid mosaic model
    Disperses the proteins and immerses them in the phospholipid bi layer, which is in a flid state.
  5. The core of the membrane is hydrophobic. True or false
  6. Most lipids and some proteins can drift laterally
    True rarely across center. Flip flopping
  7. What are integral proteins?
    Proteins that penetrate the hyrdophobic core of the lipud bilayer.
  8. Peripheral proteins
    Not embedded in the lipid bilayer at all they are appendages loosely bound to the surface of the membrane
  9. Cell-cell recognition
    Cells ability to distinguish one type of neifhboring cell from another, is crucial to the functioning of an organism
  10. Hyrdophilic substances avoid contact with the Lipid bilayer
    By passing through transport proteins.
  11. Diffusion
    • The tendency for
    • Molecules of any substance to spread out into available space
  12. Function of membrane proteins.
    Transport, enzymatic activity, signal transduction, inter cellular joining, cell-cell recognition, and attachment to the cytoskeleton and extracellular matrix.
  13. Membrane carbs are important for cell cell recognition.
    Short chains of sugars are linked to proteins and lipids on the exterior side of the plasma membrane, where they can interact with the surface molecules of other cells.
  14. Passive transport is
    Diffusion across a membrane.
  15. Cell survival depends on balancing water uptake and loss.
  16. Facilitated diffusion.
    A transport protein speeds the movement of water or a solute across membrane down its concentration gradient.
  17. Active transport
    The pumping of of solutes against their gradients. Specific membrane proteins use energy,usually in the form of ATP, to do this work.
  18. Exocytosis and endocytosis used to _____
    Transport large molecules. in exocytosis- transport vesicles migrate to the plasma membrane, fuse with it, and release its contents. Endocytosis-large molecules enter cells. Phagocytosis, pinocytosis, receptor- mediated endocytosis
  19. Cell division functions in reproduction, growth, and repair.
    unicellular organisms reproduce by cell division. Multicellular organisms depend on it for development from a fertilized egg, growth, and repair.