lecture 4- cell membrane transport
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| Describe the characteristics of a phospholipid bilayer | water soluble compounds unable to pass through.
important for maintaining Intra celluar fluid.
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| what is 4 characteristics of a membrane? | -isolation
-regulates enviromental exchange
-sensitivity
-structural support
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| membrane carbohydrates: | proteogycans, gyloproteins, glycolipids and glycocalyx.
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| Membrane proteins | integral membrane - encased in membrane. Transmembrane protiens.
Peripherial proteins - inner or outter surface of membrane,
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| Describe how proteins contribute to the structure and function of the cell membrane | Anchoring proteins
–stabilise the cell
Recognition proteins
–immune response
Enzymes
–Peripheral and integral
Channels
–Gaps in membrane
–Allows movement of water and ions
–Molecule specific
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| Explain why the cell membrane is more permeable to lipid soluble substances and small molecules than to large water-soluble substances |
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| Describe how the following mechanisms facilitate the transport of substances across cell membranes: –diffusion –osmosis –facilitated diffusion –active transport –endocytosis –exocytosis | endocytos-
pinocytosis- cell drinking
phagocytosis - cell eating
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| Describe the effects of isotonic, hypertonic and hypotonic solutions on cells | Isotonic solution(equal)
–Same solute concentration inside cell vs outside
Hypotonic solution (expand)
–Solute concentration inside cell highe rvs outside
Hypertonic solution (shrivel)
–Solute concentration inside cell lower vs outside
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| Describe how carbohydrates contribute to the structure and function of the cell membrane | –Lubrication and protection
–Anchoring and locomotion
–Specificity and binding
–Recognition
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Created by:
dlbarton
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