BLINN BIOL- 1406 EXAM 2 Stacy fully solved graded A+
BLINN BIOL- 1406 EXAM 2 Stacy fully solved graded A+what is a cell? - correct answer A cell is the smallest unit of life that can function independently. cell theory? - correct answer Cell theory explains the prevalence and commonalities of cell 1. all organisms are made of one or more cells 2. the cell is the fundamental unit of life 3. all cells come from preexisting cells Implications of the cell theory - correct answer 1. Functions of all cells are similar. 2. Life is continuous. 3. Origin of life was the origin of cells. 4. Cells are tiny Cells are small because? - correct answer high surface area-to-volume ratio is essential. - As a cell volume increases, chemical activity increases, along with the need for resources and waste removal. - Surface area becomes limiting. Thus large organisms consist of many small cells. Microscopes: Magnification - correct answer Increases apparent size Microscopes: Resolution - correct answer Clarity of magnified object—minimum distance two objects can be apart and still be seen as two objects. Two basic types of microscopes - correct answer - Light microscopes: glass lenses and light; resolution = 0.2 μm - Electron microscopes: electromagnets focus an electron beam; resolution = 0.2 nm
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