What toxic oxygen form of oxygen does the enzyme catalase detoxify?
A. Superoxide free radical
B. Singlet oxygen
C. Peroxide anion
D. Hydroxyl radical
Answer: C. Peroxide anion
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Microbiology Chapter 6
- Which of the following is an example of a metabolic activity that could be used to measure microbial growth?
- Which of these quantification methods would be most accurate when quantifying a filamentous mold culture?
- Which nutritional requirement is iron (Fe2+) considered to be a part of?
- During which phases of the bacterial growth curve are there no changes in the number of living cells?
- At which stage of bacterial growth is cell division the most rapid?
- Cells that live in high salt environments are called ________.
- Which of these does not contain nitrogen?
- Which of these microbes would not contain superoxide dismutase?
- All of the following are true about agar except ______.
- The large intestine is an environment that lacks any oxygen. Which of the following types of organisms would most likely be found there?
- While ____ is able to detoxify a reactive oxygen species, it also produces one, hydrogen peroxide.
- At which stage of bacterial growth does cell division NOT occur?
- Lactic acid bacteria, the bacteria involved in making kimchi and yogurt, are strict fermenters. What can you say about their requirements for oxygen?
- Penicillin functions by inhibiting the formation of new cell walls. At what stage of bacterial growth is penicillin most effective? Hint - when do you think cells are making new cell walls?
- You want to quantify a culture of motile bacteria. Which method of quantifying would you use if you needed the most accurate information as soon as possible?
- Salts and sugars work to preserve foods by creating a ____.
- Which of the following is the best definition of generation time?
- What is the difference between peroxidase and catalase?
- Most human pathogens are _________.
- Which method of quantifying bacterial numbers would be most effective for measuring the numbers of bacteria in drinking water, when you expect the numbers to be relatively low?
- Which pH is considered alkaline?
- The term aerotolerant anaerobe refers to an organism that ______.
- In which phase is the rate of cell death equal to the rate of cell growth?
- Luria Broth (LB) is a medium containing Tryptone, yeast extract, and sodium chloride.
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