Passive, Facillitated and Active Transport Flashcards
Define the difference between Active and Passive transport
Active Transports requires energy. Whereas passive transport does not.
In the case of a single uncharged molecule what force determines its direction?
The concentration on each side of the membrane
In the case of a solute that carries a net charge what force determines its direction?
both its concentration gradient and the electrical potential difference
The concentration gradient and the electrical gradient combine to form what?
the net driving force or the electrochemical gradient
Which transport requires the cell to expend energy
Active Transport
Which transport requires movement against their electrochemical gradient
Active transport
Which type of molecules diffuse the fastest?
small hydrophobic molecules.. O2 >glcerol>Glucose> H+
What are the 3 Ways to Drive Active Transport?
Coupled, ATP- driven, light-driven(bacteria)
where is the Na+ -K+ located
in the plasma membrane of most cells.
what are the 3 Types of Carrier-mediated Transport?
- uniport
- symport
- antiport
What role does Na+ play in the transportation of glucose?
When both are bound this induces a conformational change that results in the release of glucose and Na+ into the cytosol
OCCLUDING JUNCTIONS (2)
- Tight junctions (vertebrates only)
2. Septate junctions (invertebrates mainly)
ANCHORING JUNCTIONS with actin filament sites (2)
- cell-cell junctions (adherens junctions)
2. cell-matrix junctions (focal adhesions)
ANCHORING JUNCTIONS with intermediate filament attachment sites (2)
- cell-cell junctions (desmosomes)
2. cell-matrix junctions (hemidesmosomes)
COMMUNICATING JUNCTIONS (2)
gap junctions & plasmodesmata (plants only)
