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Exam I 2005 - :> i i BIO321 Fall 2005 Exam 1 12 A desmosome...

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:> i i Questions 1 to 13 i The followingquestions ~ ontain statements that are either true or false. Choose A if the statement is true, or B if the statement is false. 1. All eucaryotic cells hav1 one nucleus. A. True B.False I 2. Procaryotes evolved froin eucaryotic mitochondria. A. True B. False I I I 3. Although most types of ~Ollagenassemble into fibrils, type IV collagen assembles into a feetlike network that forms the core of all basal lamina. ! A. True B.False I BIO321 Fall 2005 Exam 1 - 4. Gap junctions connect l ' e cytoskeletalelementsof one cellto a neighboring cell or the e tracellular matrix. A. True B. False i. I 5. The nucleus contains allithe DNA, but not all the RNA in a cell I A. True B. False , I 6. Body plans of early embkos from different species look remarkably similar. It is O ~ later in embryonic development that these similarities begi to disappear. The reasons why body plans resemble each other ough phylogeny isdue to conservation in genetic sw tches.fhat c~ntrol fundamental cellular rearrangements during dev lopment. A. True B.False I 7. One function of desmos~mes is to provide strength to an epithelial sheet that prevents cells from ripping apart- A. True B.False I 8. In terms of phospholipid composition, the plasma membrane lipid bilayer is asymmetricj A. True B. False i 9. A cell will only adhere t f another if there are;adhesion molecules on the surface 0 the other cell identical to its own. A. True B. False I , 10. Cholesterol makes me ~ ranes less fluid by limmobilizing the heads of neighboring lipid olecules, and prevCfntsphospholipids from solidifying at low te peratures A. True B. False I 11. One way to study the flpidity of the plasma fembrane is to use fluorescent antibodies t track the moveme1ts of integral proteins in the membrane ~nder different experimental conditions. ' 12. A desmosome bears the same relationship to a hemidesmosome that an adhesion belt does to a focal contact 13. All the different forms of NCAM and cadherins arise from different genes. A. True B. False Questions 14 to 36 The following questions are multiple choice type.
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