Microbiology: Principles and Explorations
10th Edition
ISBN: 9781119390114
Author: Black
Publisher: WILEY
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Chapter 7, Problem 2.3SC
Summary Introduction
To describe: Does the fastidious microbes contain a lesser or greater number of enzyme types than micro-organisms having simple nutritional needs.
Introduction: Fastidious microbes are those that have special nutritional requirements for their growth and are difficult to grow in the laboratory. Some examples of fastidious microbes are Neisseria, Mycoplasma and Mycobacterium.
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All of the following are ways microorganisms adapt to limited nutrients except:
synthesize increased amount of enzymes for uptake and metabolism of limited nutrients
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synthesize enzymes needed to use a different nutrient acetic acid
adjust the rate at which they metabolize nutrients
Which of the following would be an example of a microbial chemoautotroph?
A yeast using oxidation/reduction of organic compounds as the energy source and organic compounds as the carbon source.
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A bacterium using oxidation/reduction of inorganic compounds as the energy source and CO2 as the carbon source.
Fill in the names of the microorganisms that like to live in according to the temperature (Give a graph showing the growth level of each microorganism according to the temperature and fill in each name) (Ex. mesophile, psychrophile, etc.)
Fill in the names of the microorganisms that like to live in according to the temperature (Give a graph showing the growth level of each microorganism according to the temperature and fill in each name) (Ex. mesophile, psychrophile, etc
Chapter 7 Solutions
Microbiology: Principles and Explorations
Ch. 7 - What are the differences between the lag phase and...Ch. 7 - How does logarithmic rate of increase differ from...Ch. 7 - Prob. 1.3SCCh. 7 - Why does a direct microscopic count of bacteria...Ch. 7 - What does the ending -phile mean? Distinguish...Ch. 7 - What enzymes do most obligate anaerobes lack? How...Ch. 7 - Prob. 2.3SCCh. 7 - Prob. 3.1SCCh. 7 - Distinguish between the various kinds of media:...Ch. 7 - What is the purpose of a stock culture? Why is it...
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- Bacteria that are obligate intracellular pathogens of humans are considered to be Autotrophs Heterotrophs Photosynthetic Hyperthermophiles Chemolithotrophs Which of the following statements best describes the pathogenesis of Clostridium botulinum? It elaborates an exotoxin that is a lecithinase that causes tissue necrosis. It elaborates a toxin that suppresses the release of inhibitory neurotransmitters. It produces a polysaccharide capsule that inhibits phagocytosis and contributes to invasion of the central nervous system. It elaborates a toxin that inhibits the release of acetylcholine at cholinergic synapses. It produces a leukotoxin that leads to abscess formation.arrow_forwardMicroorganisms are often grouped according to their optimum growth temperatures. Which groups are most likely to spoil refrigerated foods?arrow_forwardDiseases that involve biofilm-producing bacteria are of serious concern. They are not as easily treated compared with those involving free-floating (or planktonic) bacteria. Explain three reasons why biofilms can be more pathogenic.arrow_forward
- Strict anaerobes cannot live in the presnece of oxgyen because: a.)they have to mitochondria b.) they cannot absord nutrients from the envioment c.)they cannot make macromolcules d.) they lack detoxifing enzymes e.) they cannot make ATP oragnisms need phosphorous to incoroprate it in their: a.) cell membrane b.) DNA and RNA c.) ATP d.) a and c e.) a, b, and carrow_forwardThe term "turbidity" in microbiology refers to: a cloudy appearance in broth, meaning microorganisms did grow a cloudy appearance in broth, meaning microorganisms did not grow a clear appearance in broth, meaning microorganisms did not grow the clump of cells at the top of a broth a clear appearance in broth, meaning microroganisms did growarrow_forwardDiseases that involve biofilm-producing bacteria are of serious concern. They are not as easily treated compared with those involving free-floating (or planktonic) bacteria. Explain three reasons why biofilm formers are more pathogenic. Brian goes to the hospital after not feeling well for a week. He has a fever of 38 °C (100.4 °F) and complains of nausea and a constant migraine. Distinguish between the signs and symptoms of disease in Brian’s case.arrow_forward
- Can a spoilage microorganism cause foodborne illnesses? Why or why not?arrow_forwardWhy are anaerobic microbes important for making food?arrow_forwardIn microbiology, the term growth in a culture usually refers to an increase in O 1) the number and size of microbial cells. O 2) the amount of ATP consumed. O 3) a microbe's size. O 4) the number of microbial cells. 5) the amount of ATP produced.arrow_forward
- Which environment has many microorganisms and which has few?arrow_forwardIn the food web that contains bacteria, what is the usual function of this organismarrow_forwardWhich of the following is not true about biofilms a) are caused by many Gram positive and Gram negative bacteria as well as algae and fungi b) are highly contagious c) are hard to treat due to impermeability to drugsarrow_forward
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