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BIO321_Exam1_Answer_Key - Key 1 All eucaryotic cells have...

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Key B 1 1. All eucaryotic cells have one nucleus. - ( False ) red blood cells, some protozoa, giardia B 2 2. Procaryotes evolved from eucaryotic mitochondria. - ( False ) A 3 3. Although most types of collagen assemble into fibrils, type IV collagen assembles into a sheetlike network that forms the core of all basal lamina. - ( True ) B 4 4. Gap junctions connect the cytoskeletal elements of one cell to a neighboring cell or the extracellular matrix. - ( False ) cell-cel adherens perform this function B 5 5. The nucleus contains all the DNA, but not all the RNA in a cell - ( False ) mitochondria and chloroplasts contain their own DNA A 6 6. Body plans of early embryos from different species look remarkably similar. It is only later in embryonic development that these similarities begin to disappear. The reasons why body plans resemble each other through phylogeny is due to conservation in genetic switches that control fundamental cellular rearrangements during development. - ( True ) A 7 7. One function of desmosomes is to provide strength to an epithelial sheet that prevents cells from ripping apart - ( True ) A 8 8. In terms of phospholipid composition, the plasma membrane lipid bilayer is asymmetric. - ( True ) B 9 9. A cell will only adhere to another if there are adhesion molecules on the surface of the other cell identical to its own. - ( False ) selectins are heterophilic A 10 10. Cholesterol makes membranes less fluid by immobilizing the heads of neighboring lipid molecules, and prevents phospholipids from solidifying at low temperatures - ( True ) A 11 11. One way to study the fluidity of the plasma membrane is to use fluorescent antibodies to track the movements of integral proteins in the membrane under different experimental conditions. - ( True ) A 12 12. A desmosome bears the same relationship to a hemidesmosome that an adhesion belt does to a
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