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1. Why is each of the following bacteria often resistant to disinfectants? a. Mycobacterium b. Pseudomonas C. Bacillus 2. Explain why Gram-negative bacteria are more resistant to biocides than Gram-positive bacteria. Be specific and descriptive in your response. A description of the differences between Gram-negative and Gram-positive bacteria should be included, along with an explanation of why any of those differences would have anything to do with the actions of biocides. 3. Label the graph below using the text for a comparison of the effectiveness of various antiseptics. Explain the labeled graph (what it represents or means), and briefly describe each method indicated (how the method exerts its effects) 100 80F 2 60 40 S 20 10 20 40 60 80 100 120 Time (sec) Microbiology: An Introduction. 4. Describe three situations in which the same microbe would be considered a serious contaminant in one case and completely harmless in another


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