membrane structure and function
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Function of plasma membrane ? | - boundary
- it only lets in certain ions or substances
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| Phospholips are amphipathic which means? | They are both hydrophilic and hydrophobic
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| How are proteins arranged to contribute to membrane function? | Different proteins convey different properties to each membrane
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| What are Integral and Peripheral proteins? | Integral are inserted within the membrane and Peripheral are attached to membrane surface
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| Why do proteins attach to cytoskeleton or extracellular fibers? | Help give animal cells a stronger framework
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| 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
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| How do ions and other polar molecules pass into and out of cells? | By way of transport proteins
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| What determines the direction of traffic across a membrane? | Diffusion
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| What causes diffusion? | substances diffuse from an area of higher concentration to an area of lower concentration
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| Why is diffusion spontaneous? | the direction of the movement decreases the free energy of the system
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| 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
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| What is osmosis? | the diffusion of water across a semi-permeable membrane
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| 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
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| What does hypotonic mean? | lower solute concentration
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| what does hypertonic mean? | greater solute concentration
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| What does Isotonic mean? | equal solute concentration
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| What is water potential? | a measurement that combines the effects of solute concentration and pressure
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| 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
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| Do water molecules stop moving in iostonic conditions? | No, they continue to diffuse, however there is no net movement
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| What is facilitated diffusion? | Diffusion of solutes with the help of transport proteins
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| Is facilitated diffusion passive or an active process? | Passive, no energy is used
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| Why do solutes need a protein to facilitate their diffusion? | They are too polar to pass through the lipid bilayer
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| what is membrane potential? | the voltage across a membrane
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| How is membrane potential maintained? | An unequal distribution of anions inside the cell to cations outside the cell
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| what is endocytosis? | importing things from outside
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| what is phagocytosis? | endocytosis of large particulate substances
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| what is pinocytosis? | endocytosis of fluid and dissolved solutes
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| what is exocytosis? | dumping of vesicles given off by the golgi body. Insulin from pancreas.
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