Please answer the following questions. No Plagiarism. Thank You!
Chapter 2 questions
1. What are mechanisms of antimicrobial action of Triclosan and Povidone? –
2. What are concentrations of ethanol or propanol alcohol required for hand antiseptics? –
3. Why isn’t 100% ethanol effective against bacteria? – .
4. What are two the least resistant and two the most resistant forms of microbes? –
5. Is human immunodeficiency virus (HIV) resistant to disinfectants and antiseptics? Yes or No. Explain your answer –
6. Is ethyl alcohol an antiseptic or a disinfectant? –
7. What is the difference between antiseptics and disinfectants? –
8. Name disinfectants effective in killing bacterial endospores –
9. Is soap effective as an antiseptic? Yes or No. Explain your answer –
10. Name 3 or more bacterial genera whose species make up the normal flora of human skin –
Chapter 9 questions
1. Why do bacterial and fungal colonies look different? (up to 500 characters) –
2. Other than agar what else can be used as solidifying agent in media suitable for bacterial cultivation? Give 2 examples or more –
3. What is the advantage of growing bacteria on solid media? –
4. Colony size, color, and shape are critical in description of bacterial growth on solid medium. What are 3 other crucial factors,
not description of colony or a microbe itself, are typically included in description of bacterial growth on solid medium? –
5. How can you prove that the bacterial colony contains a pure culture? –
6. If you found the colony to be a mixture of organisms, what could you do to isolate them as pure cultures? –
7. You have coughed on the plate and there is no growth after incubation. Suggest 2 or more reasons why no bacterial growth was observed on the plate –
Chapter 12 questions
1. What is the difference between spontaneous mutation and induced mutation? –
2. What is the damage UV light causing to DNA? –
3. Define term mutagen. Give two examples of mutagens –
4. How is nitrous acid causing mutations in DNA? –
5. Both nitrous acid and ethidium bromide are causing mutations in DNA. Which compound is more dangerous? Explain your answer –
6. Explain the molecular basis for sickle-cell disease (up to 500 characters) –
7. In lab experiments the lids of Petri dishes were removed during exposure of bacteria to UV light. Explain why –
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