ETEXT CAMPBELL BIOLOGY IN FOCUS INSTANT
3rd Edition
ISBN: 9780135964422
Author: Urry
Publisher: PEARSON
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Chapter 24, Problem 6TYU
Summary Introduction
Introduction:
Symbiosis is a biological interaction between organisms of different species. The relationship could benefit both organisms (mutualism), or only one (commensalism). It may be detrimental to one (
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Define the following terms: a. endotoxin b. periplasmic space c. slime layer d. lipopolysaccharide e. pilus
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Group of answer choices
A. fimbriae
B. pili
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Chapter 24 Solutions
ETEXT CAMPBELL BIOLOGY IN FOCUS INSTANT
Ch. 24.1 - What hypothesis did Miller test in his classic...Ch. 24.1 - How would the appearance of protocells have...Ch. 24.1 - Prob. 3CCCh. 24.1 - Prob. 4CCCh. 24.2 - Contrast the cellular and DNA structures of...Ch. 24.2 - Distinguish between the four major modes of...Ch. 24.2 - Prob. 3CCCh. 24.2 - Prob. 4CCCh. 24.3 - Although rare on a per gene basis, new mutations...Ch. 24.3 - Distinguish between the three mechanisms by which...
Ch. 24.3 - In a rapidly changing environment, which bacterial...Ch. 24.3 - WHAT IF? If a nonpathogenic bacterium were to...Ch. 24.4 - Explain how molecular systematics and metagenomics...Ch. 24.4 - WHAT IF? What would the discovery of a bacterial...Ch. 24.5 - Explain how prokaryotes, though small, can be...Ch. 24.5 - Prob. 2CCCh. 24.5 - Prob. 3CCCh. 24.5 - Prob. 4CCCh. 24 - Which of the following steps has not yet been...Ch. 24 - Fossilized stromatolites A. more than 2.8 billion...Ch. 24 - Prob. 3TYUCh. 24 - Photoautotrophs use A. light as an energy source...Ch. 24 - Which of the following statements is not true? A....Ch. 24 - Prob. 6TYUCh. 24 - Prob. 7TYUCh. 24 - SCIENTIFIC INQUIRY INTERPRET THE DATA The...Ch. 24 - FOCUS ON EVOLUTION In patients infected with...Ch. 24 - FOCUS ON ENERGY AND MATTER In a short essay (about...Ch. 24 - Prob. 11TYU
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- Recently, a microbe that is able to digest cellulose was discovered in a hot spring with an average temperature of 95°C. This microbe most likely belongs to which of the following groups? A. Archaea B. Proteobacteria C. Cyanobacteria D. Spirochetesarrow_forwardWhich of the following bacteria would have the above cell boundary structure? A. Mycobacterium B.Clostridium C. Mycoplasma D. Borreliaarrow_forwardDefine the following terms:a. endotoxinb. periplasmic spacec. biofilmd. slime layere. bacterial capsulearrow_forward
- a) 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_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_forwardwas used by Joseph Lister to clean wounds and surgical instruments: A.Antibiotics b.Chlorine water Carbonic acid dAntitoxins e. Carbolic acid Which one of the following does not apply to the bacterial glycocalyx? It is not responsible for virulency b .It allows the organism to resist drying C. It may allow an organism to resist phagocytosis d.It is composed of carbohydrates E. It is enclosed by the cell wallarrow_forward
- What is/are the usual habitat(s) of endospore-forming bacteria that are agents of disease? a. the intestine of animals c. water b. dust and soil d. foodsarrow_forwardWhich of the following statements correctly describes exotoxins and endotoxins produced by various bacteria? A. endotoxins are secreted into the environment while the bacteria are still alive B. exotoxins are secreted into the environment while the bacteria are still alive C. exotoxins are only released into the environment when the bacteria die and their cell walls break down D. exotoxins are components of the outer membrane of the bacteria that produce themarrow_forwardWhich of the following is true of microbial biofilms? A. Biofilms are restricted to freshwater environments. B. Biofilms typically are small because resources such as nutrients and oxygen are unable to circulate through them. C. Cells within the biofilm are encased within a layer of polysaccharide. D. Biofilms almost always consist of only a single bacterial speciesarrow_forward
- Diseases 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_forwardExplain how each of the following contributes tothe virulence of bacteria:a. production of endotoxinb. spore formationc. presence of a capsulearrow_forwardIdentify the genus that best fits each of the following descriptions: a. This organism can produce a fuel used for home heating and for generating electricity. b. This gram-positive genus presents the greatest source of bacterial damage to the beekeeping industry. c. This gram-positive rod is used in dairy fermentations. d. This gammaproteobacterial genus is well suited to degrade hydrocarbons in an oil spill.arrow_forward
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