Control Cultures, Mixed Cultures, and Pure Cultures in Evaluating Disinfectants

Week 6 – Review Sheet
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Week 6 – Review Sheet
Exercise 1 - Disinfectants1. What does bactericidal mean? Bacteriostatic? Virucidal? Fungistatic?
* Bactericidal is an agent capable of targeting and killing bacteria, and some bacteria have resistance to certain bactericides (Tighe & Brown, 2019).
* Bacteriostatic is an agent capable of preventing the growth of bacteria.
* Virucida lis a virus-destroying agent.
* Fungistaticis an agent that inhibits the growth of fungi.
2. Why are control cultures necessary in evaluating disinfectants?
* Control cultures are necessary in evaluating disinfectants because they help determine whether the disinfectant killed the bacteria or not.
3. What factors can influence the activity of a disinfectant?
* The factors that can influence the activity of a disinfectantinclude the pH levels, temperature and time of exposure, disinfectant concentration, and the number of microorganisms.
4. Why do microorganisms differ in their response to disinfectants?
* The type of microbes present, their structure, and their resistance to disinfectants influence how microorganisms respond to disinfectants.
5. What microorganisms are most susceptible to disinfectants?
* Microorganisms most susceptible to disinfectants are gram-positive bacteria, viruses, and hyphae.