Microbial Growth ch 6/Control of Microbial Growth ch 7 – Flashcards
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In figure 6.1 which line best depicts the growth of a facultative anaerobe in the absence of O2?
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| B |
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| Salts and sugars work to preserve foods by creating a? |
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| hypertonic environment |
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| The term facultative anaerobe refers to an organism that? |
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| use oxygen or grows without oxygen |
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| In figure 6.2 which section shows a growth phase where the number of cells dying equals the number of cells dividing? |
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| C. Stationary Phase |
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| A culture medium on which only Gram-positive organisms grow and a yellow halo surrounds Staphylococcus aureus colonies is called? |
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| Differential Medium |
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| A culture medium consiting of agar, human blood, and beef heart is a? |
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| Complex medium |
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| During which growth phase will gram-positive bacteria be most susceptible to penicillin? |
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| Log phase |
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| In figure 6.4 in which tube are microaerobes growing? |
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| E. |
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Psychotrophic organisms are often responsible for food spoilage in refrigerator foods? True or False |
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| True |
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| Which of the following does NOT kill Endospores? |
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a. autoclaving b. pasteurization c. incineration d. hot-air sterilization
Answer is b |
