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33 Cards in this Set
- Front
- Back
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Define Solution |
The mixture of 2 substances, the solvent + Solute |
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Define Phospholipid |
The main molecule of the cell membrane which forms 2 layers and helps keep the cell separate from its environment |
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Define Concentration |
The amount of a specific substance in a solution |
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Define Homeostasis |
The act of maintaining a stable environment in living organisms |
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Define Diffusion |
The movement of molecules from an area of high concentration to an area of low concentration |
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Define solute |
A substance that's being dissolved in a solution, a good example would be the salt in saltwater |
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Define Hydrophobic |
To dislike or be repelled from water |
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Define Equilibrium |
The result of homeostasis or state of balance |
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Define Selectively Permeable |
A characteristic where only certain substances are able to move through a barrier such as a membrane |
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Define Solvent |
A substance that dissolves another, a good example is water |
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Define Concentration Gradient |
Term used to describe when there is a difference in the concentration of substances in an area |
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Define Hydrophilic |
To like or be attracted to water |
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What two major parts is a Phospholipid Bilayer made up of? |
Phoso head - (Polar) so hydrogen bonds with water stay in place
Fatty acid tails - (Non-Polar) to cause a barrier between the cell and the surrounding environments. |
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What two parts does a phospholipid structure contain? |
Phosphorus "heads" which are (polar)
Fatty Acid tails which are (non-polar) |
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What do Integral proteins do? |
- They go all the way through the membrane
- Can act as a channel, pump, or gate to help move molecules through |
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What are some facts on Peripheral proteins? |
- Located on one side of the membrane surface - Usually act as enzymes - Active site is location for chemical reaction - Can also act as receptors for other molecules |
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What are some facts on Carbohydrate Chains? |
-Attached to some of the phospholipids and proteins - One of their more important functions is to act as cellular ID cards
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How does the cell membrane maintain cellular homeostasis ? |
By being selectively permeable, in other words (It regulates what can enter and leave the cell) |
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What combo of several major factors determine what can pass through the cell membrane? |
-Size & Polarity of molecule (POLAR VS. NON POLAR)
- Size of pores in membrane
- Presence or absence of electrical charges on molecules (ex. ions)
- If ATP is required or not, ATP = energy |
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Hydrophilic is... |
Water-loving phosphrous head |
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Hydrophobic is... |
Fatty acid tails |
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Hypotonic is... |
When most things are inside of the cell (.....) |
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Hypertonic is... |
When most things are outside of the cell ..( )... |
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What is diffusion? |
Random movement of particles from an area of higher concentration to lower concentration to even out |
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Osmosis |
Diffusion of water |
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Solute = |
Stuff (example : sugar) |
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Solvent = |
Liquid (example : water) |
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Isotonic ... |
Equal solvent and solute inside and outside of the cell |
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What statements are supported by the fluid-mosaic model of membrane structure? |
- The cell membrane is composed of carbohydrates floating in a sea of lipids
- The cell membrane is a lipid layer in which proteins float |
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A red blood cell placed in distilled water will swell and burst due to the movement of... |
Water molecules moving by osmosis in the cell |
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What term is closely associated with the selective permeability of the cell membrane? |
Homeostasis |
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A cell that has deformity or irregularities in transport proteins may not be able to |
move large particles into the cell |
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Which of the following is a true statement regarding the following situation |
There will be a net movement of water out of the cell |
