Test Two Class Notes

Test Two Class Notes - TestTwoClassNotes 21:18...

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Test Two Class Notes 21:18 Passive Transport Movement down a concentration gradient requires energy employs a carrier 1, 2 and 3 1 and 3 2 and 3 Active Transport Movement down a concentration gradient  Requires energy Employs a carrier molecule 1,2 and 3 1 and 3 2 and 3 Diffusion  movement of molecules down concentration gradient Osmosis
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Diffusion of water From higher (fewer solutes) water potential to lower water potential Problems configuring organisms What if the concentration of solutes differs between the intracellular compartment  and the environment? Hypertonic Lower water potential  More solutes dissolved Hypertonic solutions will tend to gain water Hypotonic Higher water potential Fewer solutes dissolved Hypotonic solutions will tend to lose water Isotonic Equivalent water potential Equivalent number of solutes dissolved When solute concentrations are equal on both sides of the diffusion barrier the  molecules no longer move? True False
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Marine invertebrates Isotonic with seawater Accumulate free amino acids to match the tonicity of seawater Marine elasmobranch fishes Sharks and rays Isotonic with seawater Accumulate up to 0.5 M urea Freshwater bony fish (teleost fish) Hypertonic to freshwater Marine bony fish (teleost gish) Hypotonic to seawater Isotonic marine invertebrates tend to: Gain water Lose water Neither gain nor lose water  Freshwater teleost fish tend to: Gain water Lose water Neither gain nor lose water Marine teleost fish tend to:
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Gain water Lose water Neither gain nor lose water What kind of molecules would pass through a membrane, i.e., a phospholipid  bilayer? Polar Charged Nonpolar Small Large 1 and 4 1, 2 and 4 3 and 4 Which way will water flow? To the right (the higher sugar concentration) To the left (the lower sugar concentration) When does the net movement to the right stop? Until you have equivalent concentrations on the left and right A marine teleost fish is  ________to sea water. hypertonic isotonic hypotonic
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A marine teleost fish will tend to ______ water. Gain Lose How do cells regulate metabolism? Metabolism= biological chemical reactions True False How do cells organize and control the chemical reactions that support life? Metabolic Transformations Chemical reactions Small steps Controlled processes Each step controlled by a protein catalyst Enzyme Biological Chemical Reactions Regulated by protein catalysts- enzymes  Synthesis of energy carrier molecules to store energy, transport it from place to  place, regulate its flow Couple reactions together so that unfavorable reactions can occur at the expense  of reactions that release energy
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Enzymes Protein catalysts Not used up
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This note was uploaded on 08/22/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

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Test Two Class Notes - TestTwoClassNotes 21:18...

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