BIOLOGY 207 Study Guide - Peptidoglycan, Eukaryote, Oil Immersion

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30 Oct 2014
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Lab 2; week of jan. 19: administrative issues. 30 pts: practicum #1 (week of march 2) 30 pts: practicum #2 (week of april 13) 20 points: 2 points/wk for clean up. 20 points: 2 quizzes: weeks of feb. 9 and march 30. Some condensers were not aligned properly may have to shift slightly. Clean objectives & oculars before beginning; may help to clear up the images. There are communities in most natural environments. Add a pinch of pepper (~0. 1 g) to your tube of sterile water be sure that some sinks to the bottom. Label the tube with your initials and lab section. Differentiates between gram + / - cell walls. Gram (+): thick peptidoglycan layer purple. Gram (-): thin peptidoglycan layer between two membrane layers pink. Composed of: polymers of n-acetylglucosamine (nag) and n- acetylmuramic acid (nam); cross- linked together by peptides (short amino acid chains) Purpose: maintain shape against internal pressure (higher for gram (+) cells)

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