Biology 1406 Exam 2 Review (chapters 6,7,8) with 100% correct answers

Biology 1406 Exam 2 Review (chapters 6,7,8) with 100% correct answersName the scientists who first studied cells and mention their contributions. - correct answer Robert Hooke: first person to view cells, first person to build a microscope. Antonie van Leeuwenhoek: first person to view living cells (bacteria, pond water) .Matthias Schleiden and Theodore Schwann (1830): proposed the cell theory (all living things are composed of cells) still true except for viruses. Who was the first scientist to view cells/build a microscope? - correct answer Robert Hooke Who was the first person to view living cells (bacteria)? - correct answer Antonie van Leeuwenhoek Which two people proposed the cell theory (all living things are composed of cells)? - correct answer Matthias Schleiden and Theodore Schwann. What are the techniques used to study cell structure? - correct answer staining (so they are more visible, cell fractionation (takes the cells apart & separates the major organelles by size in order to study things individually) and microscopy (using a microscope to see the cells) 3. Describe cell fractionation. What is this technique used for? - correct answer the method of taking cells apart and separating the major organelles by size in order to study the organelles individually 4. Compare and contrast the light microscope and electron microscope. - correct answer the light microscope uses light and stain to examine cells and is 1000x better than the human eye. The electron microscope uses magnets and electrons to magnify images and is 1,000,000x better than the human eye. 5. Why are multicellular organisms made up of numerous small cells rather than a few large ones? - correct answer because its easier to move waste and nutrients between lots of small cells, and they don't let go of as much waste as larger cells. 6. What is the endosymbiosis theory? - correct answer the theory that eukaryotic cells evolved from prokaryotic cells by a prokaryotic cell living inside another prokaryotic cell in a symbiotic relationship.