IU BIOL-L 112 Exam 1 with
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precise detailed answers 5 5
phospholipids - Correct answer ✔major component of cell membranes,
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amphipathic
fluidity - Correct answer ✔term for weak hydrophilic bonds allowing lipids
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and some proteins to drift laterally
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saturated fats - Correct answer ✔solidify at room temperature, can pack close
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together
unsaturated fats - Correct answer ✔kinks in tails which prevents close
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packing
cholesterol - Correct answer ✔regulates the fluidity of membranes
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cholesterol - Correct answer ✔"temperature buffer" for membranes, 4 closed
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carbon rings
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temperature buffer - Correct answer ✔at a low temperature, cholesterol
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hinders the close packing of phospholipids and keeps membranes more fluid.
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at a high temp, cholesterol makes the plasma membrane less fluid by
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restraining phospholipid movement 5 5
, non polar molecules - Correct answer ✔can easily pass through the lipid
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bilayer
polar molecules - Correct answer ✔cannot pass through the lipid bilayer
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integral proteins - Correct answer ✔cross the plasma membrane
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peripheral proteins - Correct answer ✔attached to inner surface of the
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membrane, sometimes via integral proteins
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transport, enzyme activity, signal transduction, cell to cell recognition,
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intercellular joining, attachment to cytoskeleton and ECM - Correct answer
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✔name the 6 major functions of membrane proteins
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passive transport - Correct answer ✔first mechanism that moves molecules
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across cells5
diffusion - Correct answer ✔movement of a substance DOWN its
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concentration gradient by random thermal movement; is spontaneous (no
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energy)
equilibrium - Correct answer ✔solute molecules continue to cross the
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membrane but at a similar rate in both directions
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precise detailed answers 5 5
phospholipids - Correct answer ✔major component of cell membranes,
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amphipathic
fluidity - Correct answer ✔term for weak hydrophilic bonds allowing lipids
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and some proteins to drift laterally
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saturated fats - Correct answer ✔solidify at room temperature, can pack close
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together
unsaturated fats - Correct answer ✔kinks in tails which prevents close
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packing
cholesterol - Correct answer ✔regulates the fluidity of membranes
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cholesterol - Correct answer ✔"temperature buffer" for membranes, 4 closed
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carbon rings
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temperature buffer - Correct answer ✔at a low temperature, cholesterol
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hinders the close packing of phospholipids and keeps membranes more fluid.
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at a high temp, cholesterol makes the plasma membrane less fluid by
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restraining phospholipid movement 5 5
, non polar molecules - Correct answer ✔can easily pass through the lipid
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bilayer
polar molecules - Correct answer ✔cannot pass through the lipid bilayer
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integral proteins - Correct answer ✔cross the plasma membrane
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peripheral proteins - Correct answer ✔attached to inner surface of the
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membrane, sometimes via integral proteins
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transport, enzyme activity, signal transduction, cell to cell recognition,
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intercellular joining, attachment to cytoskeleton and ECM - Correct answer
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✔name the 6 major functions of membrane proteins
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passive transport - Correct answer ✔first mechanism that moves molecules
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across cells5
diffusion - Correct answer ✔movement of a substance DOWN its
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concentration gradient by random thermal movement; is spontaneous (no
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energy)
equilibrium - Correct answer ✔solute molecules continue to cross the
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membrane but at a similar rate in both directions
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