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Transcript
Name:_____________________________ Chapter 6 Guided Reading 1. How have microscopes contributed to the study of biochemistry? 2. Biologists use the TEM, SEM and LM to study cells. What are the advantages and disadvantages of each type of microscope? 3. In one episode of the original Star Trek series, the starship Enterprise was fighting a space-ship sized single celled organism. In another episode, crew members were attacked by single cells the size of dinner plates. Describe for the non-biologist why these episodes are clearly “science fiction”. 4. What cell structures are common to both prokaryotic and eukaryotic cells? 5. Label the prokaryotic cell below – list structure and function. 6. Contrast and compare mitochondria and chloroplasts. 7. Why are mitochondria and chloroplasts not considered part of the endomembrane system? 8. What evidences exist that support the endosymbiotic theory that mitochondria and chloroplasts used to be independent cells in their own right? 9. How does the structure of microtubules allow them to apparently move from one location of a cell to another? 10. When the cytoskeleton was first discovered, scientists thought what they were seeing were artifacts of the TEM. Why shouldn’t they have been surprised to find the cytoskeleton? (e.g. why is a cytoskeleton necessary for cells). 11. How are the cell walls of plants and bacteria similar, yet different? 12. Which would you rather have hit you; an object made of plant cells with primary cell walls or an object made of plant cells with secondary walls? Explain 13. Several years ago, a meteorite was found to be from Mars. Upon SEM examination, objects that looked like prokaryotic cells were found in the interior. This discovery caused a major splash in the scientific community. Why? 14. The structure of cilia and flagella are the same in all eukaryotic cells? Discuss how this most likely happened. 15. For each of the structures below – note the specific structure and the function of the organelle or part of the organelle. The important concept is to note how the specific structure allows for the specific function to be accomplished. a. Nucleus i. Nuclear envelope ii. Nuclear lamina iii. Chromosomes iv. Chromatin v. Nucleolus b. Ribosomes c. Endoplasmic reticulum i. Smooth ER ii. Rough ER d. Golgi Apparatus e. Lysosomes f. Vacuoles i. Food ii. Contractile iii. Central w/tonoplast g. Endomembrane system – overall h. Plastids i. Amyloplast ii. Chromoplast iii. Chloroplast 1. thylakoids 2. stroma i. peroxisomes j. cytoskeleton – pay careful attention to the details in this section i. microtubules 1. centrosomes and centrioles 2. cilia and flagella – include basal body 3. dynein walking ii. microfilaments 1. actin 2. myosin 3. pseudopodia 4. cytoplasmic streaming iii. intermediate filaments iv. Proteoglycans v. Fibronectin vi. Integrins k. What are intercellular junctions and why are they important? Contrast plasmodesmata, tight junctions, desmosomes, and gap junctions.