Term
| three principal parts of a cell |
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Definition
-Plasma(cell)membrane
-cytoplasm
a. cytosol
b. organelles
- the nucleus |
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Term
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Definition
flexible, sturdy barrier that surrounds and contains the cytoplasm of the cell
-has lipids in constant motion
-has protiens in motion with the lipids |
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Term
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Definition
| describes the structure of the plama membrane : constantly in motion fluid |
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Term
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Definition
| basic framework of the plama membrane |
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Term
| Three types of lipid molecules |
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Definition
-phospholipids (75% of bilayer)
-Cholesteral (20%)
-Glycolipids-sugar lipids(5%) |
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Term
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Definition
they are amphipathic (duel characteristics)
-hydrophilic (water loving)
-hydorphobic (water fearing)
part of the plasma membrane |
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Term
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Definition
extene through the lipid bilayer (are hydrophobic and hydrophilic) |
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Term
| protiens of the plasma membrane |
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Definition
integral: extene through the lipid bilayer (are hydrophobic and hydrophilic)
Peripheral: associate with either inner or outer (waterloving, on surface not inside) |
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Term
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Definition
| associate with either inner or outer (waterloving, on surface not inside |
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Term
| What are three passive transport processes |
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Definition
-diffusion
-nonmediated passive
-mediated passive |
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Term
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Definition
| the movement of molecules from an area of high concentrations to an area of low concentration |
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Term
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Definition
-diffusion through the lipid bilayer
-diffusion through a channel |
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Term
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Definition
| Facilitated diffision/ facilitated transport (both) |
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Term
| the transport process is classified according to two criteria, what is it? |
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Definition
-mediation
-use of energy |
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Term
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Definition
| involves assistance of a tranporter protein |
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Term
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Definition
| does not require a transporter protein |
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Term
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Definition
| uses chemicals own kinetic energy to move down a concentration gradient (doesnt make new energy) |
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Term
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Definition
| needs additional energy (from ATP) to move up a concentration gradient (makes new) |
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Term
| what are things that can get through the plasma membrane without help? Why? |
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Definition
-oxygen
-carbon dioxide
-steriods
-water
Why?
all non polar, uncharged, small
water-lipids flip and move water leaks though gaps in the hydrophobic membrane
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Term
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Definition
| difference from one side to another (think of color gradient) |
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