Microbiology: An Introduction
12th Edition
ISBN: 9780321929150
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: PEARSON
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Textbook Question
Chapter 6, Problem 8MCQ
Which of the following is not a characteristic of biofilms?
- a. antibiotic resistance
- b. hydrogel
- c. iron deficiency
- d. quorum sensing
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During which of the four phases of growth would a gram-positive bacteria be most susceptible to penicillin?
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Biofilms are restricted to freshwater environments.
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Biofilms typically are small because resources such as nutrients and oxygen are unable to circulate through them.
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Cells within the biofilm are encased within a layer of polysaccharide.
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Biofilms almost always consist of only a single bacterial species
Chapter 6 Solutions
Microbiology: An Introduction
Ch. 6 - Prob. 1RCh. 6 - Prob. 2RCh. 6 - Prob. 3RCh. 6 - Seven methods of measuring microbial growth were...Ch. 6 - By deep-freezing, bacteria can be stored without...Ch. 6 - A pastry chef accidentally inoculated a cream pie...Ch. 6 - Nitrogen and phosphorus added to beaches following...Ch. 6 - Differentiate complex and chemically defined...Ch. 6 - DRAW IT Draw the following growth curves for E....Ch. 6 - NAME IT A prokaryotic cell hitched a ride to Earth...
Ch. 6 - Two culture media were inoculated with four...Ch. 6 - Two culture media were inoculated with four...Ch. 6 - Use the following graph to answer questions 3 and...Ch. 6 - Use the following graph to answer questions 3 and...Ch. 6 - Assume you inoculated 100 facultatively anaerobic...Ch. 6 - The term trace elements refers to a. the elements...Ch. 6 - Which one of the following temperatures would most...Ch. 6 - Which of the following is not a characteristic of...Ch. 6 - Which of the following types of media would not be...Ch. 6 - An organism that has peroxidase and superoxide...Ch. 6 - E. coli was incubated with aeration in a nutrient...Ch. 6 - Clostridium and Streptococcus are both...Ch. 6 - Most laboratory media contain a fermentable...Ch. 6 - Flask A contains yeast cells in glucose-minimal...Ch. 6 - Clinical Applications and Evaluation 1. Assume...Ch. 6 - Heat lamps are commonly used to maintain foods at...Ch. 6 - The number of bacteria in saliva samples was...
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- Which 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_forwardA microbe causing a bloodstream infection is likely all of the following except A. A chemotroph B. A parasite C. A heterotroph D. A thermophilearrow_forwarda) Biofilm is: a. a complex established community of microorganisms on solid surfaces b. is a layer of millions of identical bacteria on solid surfaces c. is a layer of compounds released from the tissue as a protection against pathogenic microorganisms d. All of these are correct b) Capsule formation is associated with the virulence of pathogenic bacteria. Why? Select all that apply. a. They are sticky and attach better b. They can escape phagocytosis c. The capsule makes them grow/multiply faster d. They kill immune cellsarrow_forward
- MacConkey (MAC) Agar is used to isolate gram-negative enteric bacteria.Peptone provides nutrients necessary for growth.Bile salts and crystal violet inhibit the growth of gram positive bacteria.Lactose is a carbohydrate. When metabolized, colonies turn the medium pink.Which organism/s will grow in the medium? a. Escherichia coli b. Pseudomonas aeruginosa c. Staphylococcus aureus d. Escherichia coli & Pseudomonas aeruginosa e. Pseudomonas aeruginosa & Staphylococcus aureusarrow_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_forwardWhich of the following is not consistent with an endospore? a. It is not a means of asexual reproduction b. Considered as a virulence factor thereby increasing the bacteria's survival c. This structure makes the bacteria withstand harsh conditions in the environment d. It is presence increases bacterial susceptibility to disinfectants and radiationarrow_forward
- Which bacterium does not have the genetic machinery to convert nitrate to nitrite? O A. Paracoccus O B. Photorhabdus O C. Pseudomonas D. Bradyrhizobium E. all of the abovearrow_forwardWhich of the following effects is/are caused by formation of aninfectious biofilm?a. disseminated infection b. failure of drug therapy c. colonization of tissues d. a and b e. b and c f. all of thesearrow_forwardA particular bacterium requires techoic acid in its medium in order to grow. What would the bacterium not be able to synthesize if you were to omit the techoic acid? A. Plasma membrane B. Cell wall C. Lipopolysaccharides D. None of the abovearrow_forward
- Which of the following diseases are associated with "Biofilms" * Select one or more than on answer Which of the following diseases is/are associated with "Biofilms" Select one or more: O a. cystic fibrosis O b. prosthetic joint infections O c. endocarditis O d. periodontal diseases O e. kidney stones Which of the following microorganisms require the major available (aW) of water to proliferate? Which of the following microorganisms requires the greatest amount of available water (aW) to grow? O Penicillium spp. O Xeromyces spp. O Escherichia coli Pseudomonas aeruginosa O Staphylococcus aureus Mention and describe the two types of bacterial resistance to antibiotics. Name and describe the two types of bacterial resistance to antibiotics. of A - lagarrow_forwardDiseases that involve biofilm-producing bacteria are serious concern. They are not easily treated compared with those involving free-floating bacteria. Explain three reasons why biofilm formers are more pathogenic.arrow_forwardSecondary metabolites of microbes are formed during thephase of growth.a. exponential b. stationary c. lag d. deatharrow_forward
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