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BIO 240-75 ANSWERS Exam 2 Form A Fall 09

BIO 240-75 ANSWERS Exam 2 Form A Fall 09 - BIO24075Fall2009...

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BIO 240-75   Fall   2009 ANSWERS   EXAM 2-Form A   Correct answers are bolded: 1. Who was/were the first to propose that cell membranes are composed of a  phospholipid bilayer? a. Davson & Danielli b. Singer & Nicholson c. Gorter & Grendel d. Hans Krebs e. Peter Mitchell 2. Which of the following is one way that the cell membranes of winter wheat plants are  able to remain fluid when it is extremely cold? 3. According to the fluid mosaic model of cell membranes, which of the following is a true  statement about membrane phospholipids?  4. Which of the following would likely move through the lipid bilayer of a plasma  membrane most rapidly?  5. Water passes quickly through cell membranes because  1
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a. the bilayer is hydrophilic.  b. it moves through hydrophobic channels.  c. water movement is tied to ATP hydrolysis.  d. it is a small, polar, charged molecule.  e. it moves through aquaporins in the membrane.  6. Which of the following is correct about diffusion?
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