Microbiology: An Introduction (13th Edition)
13th Edition
ISBN: 9780134605180
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case, Derek Weber, Warner Bair
Publisher: PEARSON
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Textbook Question
Chapter 11, Problem 1MCQ
If you
- a. gram-positive cocci.
- b. gram-negative rods.
- c. gram-positive, endospore-forming rods.
- d. gram-negative, nitrogen-fixing bacteria.
- e. all of the above
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How do Gram-negative bacteria differ from Gram-positivebacteria?a. They are not pathogenic.b. Their peptidoglycan cell wall is thinner.c. Gram-negative bacteria cannot be Gram stained.d. They possess a single plasma membrane.e. Gram-negative bacteria do not photosynthesize.
Which of the following is TRUE regarding Gram negative bacteria?
a- Their cell wall is composed of a large proportion of sugars
b- Their cell wall does not absorb the Gram stain and turns pink
c- Their cell wall is composed of a small proportion of peptidoglycan
d- Two of the above statements are true
The broth culture of Bacillus subtilis showed growth even after extended heating in a waterbath, while Serratia marcescens did not. This is due to:
a. Bacillus subtilis is Gram-positive, while Serratia marcescens is Gram-negative
b. Bacillus subtilis is a spore former
c. the pigment of Serratia marcescens absorbs more radiation than other cells
d. Bacillus subtilis has enzymes that protect it from ozone
Chapter 11 Solutions
Microbiology: An Introduction (13th Edition)
Ch. 11 - The following outline can be used to identify...Ch. 11 - Compare and contrast each of the following: a....Ch. 11 - DRAW IT Draw a key to differentiate the following...Ch. 11 - Prob. 4RCh. 11 - If you Gram-stained the bacteria that live in the...Ch. 11 - Which of the following does not belong with the...Ch. 11 - Prob. 3MCQCh. 11 - Prob. 4MCQCh. 11 - Which of the following terms is the most specific?...Ch. 11 - Which one of the following does not belong with...
Ch. 11 - Which of the following pairs is mismatched? a....Ch. 11 - Prob. 8MCQCh. 11 - When Legionella was newly discovered, why was it...Ch. 11 - Prob. 10MCQCh. 11 - Prob. 1ACh. 11 - Prob. 2ACh. 11 - Bacteria are single-celled organisms that must...Ch. 11 - After contact with a patients spinal fluid, a lab...Ch. 11 - Between April 1 and May 15 of one year. 22...Ch. 11 - Prob. 3CAE
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- Bacillus subtilis and Bacillus cereus most likely showed greater resistance to UV light than Serratia marcescens. This is due to: a. Bacillus spp. are Gram-positive, while Serratia marcescens is Gram-negative b. the Bacillus spp. are spore fonners c. the pigment of Serratia marcescens absorbs more radiation than other cells d. Bacillus spp. have enzymes that protect them from ozonearrow_forwardAn infectious dose of several million cells in enteric infections seems like a lot. a. In terms of the size and abundance of microbes, could you see a cluster containing that many cells with the naked eye? b. About how long would it take an average bacterial species to reach the infectious dose of a million cells starting from a single cell? c. Why do enteric diseases require a relatively higher infectious dose than nonenteric diseases? d. Explain why antimicrobic therapy used on gram-negative bacterial infections could actually lead to illness rather than cure itarrow_forwardWhich of the following statements is true? Select one: O a. Gram-positive bacterial walls have a relatively thin layer of peptidoglycan anchored to the acids O b. Peptidoglycan is a fatty acid O c. The cell walls of bacteria are composed of peptidoglycan O d. Peptidoglycan is found mainly in the cell walls of fungi, algae and plantsarrow_forward
- Polymyxins are antibiotics that are used in the treatment of Gram-negative bacterial infections. You are given samples of two different types of bacteria. You are told that Bacteria A is Gram-negative bacteria and Bacteria B is Gram-positive bacteria. Describe, in your own words, how you would confirm the bacterial types.arrow_forwardImagine a microbiologist performed a series of Gram stains but forgot to perform the destain step during the stains. Which type(s) of erroneous results would the scientist observe? Cells that are actually gram-negative would appear gram-positive Cells that are actually gram-positive would appear gram-negative Both gram-negative and gram-positive cells would appear to be the oppositearrow_forwardComparing the different methods for counting bacterial cells, which of the following is FALSE? A. The serial dilution methods counts only viable cells. B. The turbidity method indirectly measures the number of cells observing how much light goes through a broth sample C. The turbidity method uses a spectrophotometer D. The direct microscopic method counts only viable cells E. The direct microscopic method counts both viable and non-viable cellsarrow_forward
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