BSC1105C- Lecture notes on Membrane Function

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BSC1105C- Lecture notes on Membrane Function


 
  
Created Sep 24, 2008
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ace32818

 

 
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1
Anything that enters or leaves the cell must pass through the _____
 
Plasma Membrane
2
The Membrane is composed of two Layers______and _____
 
Bilayer of Phospholipid molecules and Protein molecules embedded in the bilayer.
3
Diffusion
 
Heat energy causes molecules to move- allowing molecules to spread out over the available...
4
Diffusion
 
Passive passage of materials into the cell- no energy is need.
5
Concentration Gradient
 
difference in the concentration of molecules between the inside and outside of the cell, causing...
6
Selectively permeable
 
Only allows some molecules to enter
7
Passive transport is ____
 
diffusion across a cell membrane, because no energy is used
8
Hypotonic
 
higher water concentration, less solute
9
Hypertonic
 
lower water concentration, more solute
10
Isotonic
 
Having the same concentration
11
Hydrophilic molecules may enter through transport proteins in a process called______
 
Facilitated diffusion
12
The passage(diffusion) of water molecules across a selectively (semipermeable) membrane is...
 
Osmosis
13
When animal cells such as a red blood cell are placed into an Isotonic solution, what happens?
 
Its volume remains the same- it looses some water but an equal amount diffuses into the cell
14
When animal cells such as a red blood cell are placed into an Hypertonic(more solute, less...
 
the cell shrinks, water diffuses out of the cell
15
When animal cells such as a red blood cell are placed into an Hypotonic(less solute, more water)...
 
The cell Hydrolyzes (swells until it breaks)
16
Why dont plant cells hydrolyze (swell to bursting)
 
The cell wall is rigid and prevents the cell from bursting. the cell swells and pushes against...
17
What is Plasmolysis? pg 82
 
When a cell is placed in a hypertonic (more solute, less water) the cell looses water and the...
18
What is the Opposite of passive Diffusion?
 
Active Transport pg 83
19
What is active transport? pg 83
 
requires that a cell use energy to move molecules across a membrane. (ATP is the energy source)

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