Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
ch.7
membrane structure and function
| Question | Answer |
|---|---|
| Function of plasma membrane ? | - boundary - it only lets in certain ions or substances |
| Phospholips are amphipathic which means? | They are both hydrophilic and hydrophobic |
| How are proteins arranged to contribute to membrane function? | Different proteins convey different properties to each membrane |
| What are Integral and Peripheral proteins? | Integral are inserted within the membrane and Peripheral are attached to membrane surface |
| Why do proteins attach to cytoskeleton or extracellular fibers? | Help give animal cells a stronger framework |
| What are the different types of proteins found in the cell membrane? | - Transport - Enzymatic activity - Signal Transduction -Cell to cell recognition - Attachment to the cytoskeleton and extracellular matrix |
| How do ions and other polar molecules pass into and out of cells? | By way of transport proteins |
| What determines the direction of traffic across a membrane? | Diffusion |
| What causes diffusion? | substances diffuse from an area of higher concentration to an area of lower concentration |
| Why is diffusion spontaneous? | the direction of the movement decreases the free energy of the system |
| Does the diffusion of more than one kind of particle work together or separately? | if 2 different solutes are moving then they are moving across separate concentration gradients |
| What is osmosis? | the diffusion of water across a semi-permeable membrane |
| Since water passes freely across the membrane, how can the cell control the direction of osmosis? | The cell can concentrate solutes that are not permeable to the phosholipid bilayer on one side of the membrane |
| What does hypotonic mean? | lower solute concentration |
| what does hypertonic mean? | greater solute concentration |
| What does Isotonic mean? | equal solute concentration |
| What is water potential? | a measurement that combines the effects of solute concentration and pressure |
| How do Solutes and Pressure affect water potential? | - the solute potential of a solution is proportional to the # of dissolved molecules - Pressure potential is the physical pressure on a solution |
| Do water molecules stop moving in iostonic conditions? | No, they continue to diffuse, however there is no net movement |
| What is facilitated diffusion? | Diffusion of solutes with the help of transport proteins |
| Is facilitated diffusion passive or an active process? | Passive, no energy is used |
| Why do solutes need a protein to facilitate their diffusion? | They are too polar to pass through the lipid bilayer |
| what is membrane potential? | the voltage across a membrane |
| How is membrane potential maintained? | An unequal distribution of anions inside the cell to cations outside the cell |
| what is endocytosis? | importing things from outside |
| what is phagocytosis? | endocytosis of large particulate substances |
| what is pinocytosis? | endocytosis of fluid and dissolved solutes |
| what is exocytosis? | dumping of vesicles given off by the golgi body. Insulin from pancreas. |
Created by:
young kodak
Popular Biology sets