Microbiology: Principles and Explorations
9th Edition
ISBN: 9781118743164
Author: Jacquelyn G. Black, Laura J. Black
Publisher: WILEY
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Chapter 6, Problem 10SQ
Summary Introduction
Introduction: Oxygen is required for growth and survival. Microorganism can be categorized according to their oxygen requirement as facultative anaerobes, microaerophile, and obligate aerobes.
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TOPIC : MICROBIAL GROWTH
Classify the bacteria that is most likely involved in each situation provided according to their classification (as to microbial growth requirements).
CHOICES: A. Obligate aerobe ,B. Obligate anaerobe, C. Microaerophile, D. Aerotolerant anaerobe, E. Mesophile, F. Thermophiles
1.The bacteria under study thrives at the alveolar ducts in the lungs causing respiratory disease.
2.In the experiment, the agar plate containing an axenic culture was originally incubated inside a candle jar for one day and then transferred to an oxygen-rich incubator for another day. Findings: the microbial growth persisted and stayed the same regardless of the specific type of incubation employed.
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4.The spoiled bottle of wine that was stored at standard room temperature…
Define microbial growth. Outline the effects of temperature, pH, osmotic pressure and oxygen onmicrobial growth.
Compare and contrast oxygen requirements for obligate anaerobes and microaerophiles. Describe one laboratory media that can cultivate microbes with various oxygen requirements. Include the chemistry and how obligate anaerobes and microaerophiles would look if grown on this media.
Chapter 6 Solutions
Microbiology: Principles and Explorations
Ch. 6 - What are the differences between the lag phase and...Ch. 6 - How does logarithmic rate of increase differ from...Ch. 6 - Prob. 1.3SCCh. 6 - Why does a direct microscopic count of bacteria...Ch. 6 - What does the ending -phile mean? Distinguish...Ch. 6 - What enzymes do most obligate anaerobes lack? How...Ch. 6 - Prob. 2.3SCCh. 6 - Prob. 3.1SCCh. 6 - Distinguish between the various kinds of media:...Ch. 6 - What is the purpose of a stock culture? Why is it...
Ch. 6 - Prob. 1CCSCh. 6 - Exactly 100 bacteria with a generation time of 30...Ch. 6 - In the above example, do you think that the number...Ch. 6 - Prob. 3CTQCh. 6 - Prob. 1SQCh. 6 - Match the following growth phase terms to their...Ch. 6 - Which of the following is the best definition of...Ch. 6 - Prob. 4SQCh. 6 - The most probable number (MPN) technique is a...Ch. 6 - Match the terms with their definitions:Ch. 6 - Prob. 7SQCh. 6 - Why do foods containing a high concentration of...Ch. 6 - Some bacteria have complex nutritional...Ch. 6 - Prob. 10SQCh. 6 - Which type of cell will shift to aerobic...Ch. 6 - Which of the following statements about endospores...Ch. 6 - Prob. 13SQCh. 6 - Blood agar is often used to observe changes in the...Ch. 6 - A bacterial medium that contains 20 grams of beef...Ch. 6 - MacConkey agar contains the dye, crystal violet,...Ch. 6 - Prob. 17SQCh. 6 - What are the purposes of carrying out the streak...Ch. 6 - Prob. 19SQCh. 6 - During quorum sensing, bacteria sense their...Ch. 6 - Prob. 21SQCh. 6 - Identify the position of each of the following on...
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- How do microbes reduce the effects of oxygen toxicity? Explain how microbial growth patterns relate to oxygen toxicity.arrow_forward1(a)What is a psychrotroph? (b)From what natural sources would you isolate a thermophile? A psychrophile? (C)How does temperature affect the growth of a microorganism? (D)State the temperature class for Escherichia coli, Bacillus sp, Aeromonas sp, Micrococcus luteus, and suggest their optimum growth temperature. 2 (a)Why is dilution important when determining microbe number? (B)How does a decrease in dye colour intensity affect the microbe ? (C)State the possible sources of error if plate counts and colour intensity of dilutions are incorrect or Precautions taken to prevent this from happening. ( this is not a graded assignment)arrow_forwardContrast an aerotolerant and an obligate anaerobe interms of sensitivity to O2 and ability to grow in thepresence of O2. Compare and contrast the enzymescatalase, superoxide dismutase, and superoxidereductase in regard to their substrates and products.arrow_forward
- Select only the exclusive aerobic 4microbial pathways ahead: -Nitrate assimilation O Nitrification -Disproportionation of thiosulfate -Denitrification -Ammonium asimilation -Ammonification -Respiration -Dissimilatory sulfate reduction -Metanogenesis -Methanotrophy -ANAMOX -Assimilatory sulfate reduction -Methylotrphy -Chemolithotrophic CO2 reduction -Photossyntesis -Desulfurylation -Dissimilatory Nitrate Reduction to Ammonium -Atmospheric Nitrogen fixation -Sulfide oxidation by colorless bacteriaarrow_forwardDescribe the five phases of a microbial growth curve observed when growing microbes are grown in broth culture and discuss the causes of eacharrow_forwardTwo microorganisms that use naphthalene as a food source have the same Umax but different Ks values for naphthalene. If both types of microorganisms are inoculated at the same cell density into a liquid culture containing naphthalene as the sole carbon source (i.e. the only food source), which microorganism will outcompete the other: the one with the higher Ks or the one with the lower Ks. Why?.arrow_forward
- List 5 physical methods of controlling microbial growth, and give an example of each. Why is moist heat much more effective than dry air?arrow_forwardExplain the mechanism of action of several of the physical and chemical agents employed to control microbial growth.arrow_forwardWhich has a greater impact on the survival of an organism, temperatures above its maximum temperature or temperatures below its minimum temperature? Explain why and how this relates to typical methods used to control microbial growth.arrow_forward
- Microbial products can be classified as three major categories. With the use of sketch, briefly explain the kinetic patterns of growth and product formation in batch fermentation.arrow_forwardContrast an aerotolerant and an obligate anaerobe in terms of sensitivity to O2 and ability to grow in the presence of O2.arrow_forwardWhat is the positive and negative results of Oxygen Requirements of Microorganisms technique? (Brief explanation)arrow_forward
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