Prescott's Microbiology
11th Edition
ISBN: 9781260409062
Author: WILLEY, Joanne
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 20.3, Problem 6CC
How is Thermoplasma able to live in acidic, very hot coal refuse piles when it lacks a cell wall?
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In the diagram below, identify the structures of a cyanobacterial cell based on the following descriptions:
a) Outer cellular covering which includes:
Mucilaginous layer – outermost layer covering the cell wall; protects the cell from harmful factors of the environment
Cell wall – found just below the mucilaginous layer; 2 or 3-layered, the inner layer lies in between the outer wall layer and plasma membrane; the outer layer is made of peptidoglycan
Innermost plasma membrane – selectively permeable membrane enclosing the cytoplasm
b) Cytoplasm – found below the plasma membrane; the protoplasm which contains structures of different shapes and functions. Lamellae, which contain pigments such as chlorophylls, carotenes, xanthophylls, phycoerythrin and phycocyanin, are located in the peripheral region of cytoplasm. Ribosomes may also be found scattered in the cytoplasm.
c) Nucleic material – the nucleoplasm that is centrally located in the cell and contains chromatin in the form…
Why are Protozoa dependent on water?
Which of the following is NOT true about endospores?
O 1) Spores are resistant to heat, radiation, cold, and dessication.
O 2) One endospore germinates into one vegetative cell.
O
3) They are a method of reproduction for bacterial cells when growth conditions
are inhospitable.
O 4) Endospores are clinically significant in causing disease.
O 5) The endospore has a thick spore coat that protects it.
Chapter 20 Solutions
Prescott's Microbiology
Ch. 20.1 - MICRO INQUIRY Given that the DC/HB pathway uses...Ch. 20.1 - Prob. 2MICh. 20.1 - Prob. 1CCCh. 20.1 - Why do methanogens use the reductive acetyl-CoA...Ch. 20.1 - Prob. 3CCCh. 20.1 - Compare the ATP and NADH yield of each of the...Ch. 20.2 - MICRO INQUIRY Identify the potential electron...Ch. 20.2 - Retrieve, Infer, Apply What are thermoacidophiles...Ch. 20.2 - Prob. 2CCCh. 20.2 - Compare the carbon and sulfur metabolism of...
Ch. 20.2 - Prob. 4CCCh. 20.2 - Prob. 5CCCh. 20.3 - MICRO INQUIRY What are the mechanisms by which...Ch. 20.3 - Retrieve, Infer, Apply Why are the growth yields...Ch. 20.3 - Prob. 2CCCh. 20.3 - What is the ecological and practical importance of...Ch. 20.3 - Where are extreme halophiles found, and what is...Ch. 20.3 - What is the difference between sensory rhodopsin...Ch. 20.3 - How is Thermoplasma able to live in acidic, very...Ch. 20.3 - In what way are members of the genus Archaeoglobus...Ch. 20 - Prob. 1RCCh. 20 - Prob. 2RCCh. 20 - Prob. 3RCCh. 20 - Prob. 4RCCh. 20 - Prob. 5RCCh. 20 - Prob. 6RCCh. 20 - Prob. 7RCCh. 20 - Some believe that archaea should not be separate...Ch. 20 - Prob. 2ALCh. 20 - Prob. 3ALCh. 20 - Prob. 4ALCh. 20 - Prob. 5ALCh. 20 - Prob. 6ALCh. 20 - Prob. 7AL
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- What is unusual about the mycobacterial cell wall?arrow_forwardWhat functions do endospores have in the proliferation, dispersal and survival of bacteria? Please explain.arrow_forwardShort, hairlike structures covering the surface of the cell used only by eukaryotic cells for movement are called O 1) pseudopodia. O 2) fimbriae. O 3) cilia. O 4) pili. O 5) flagella.arrow_forward
- Why does exposure to UV radiation cause death in vegetative cells but not endospores?arrow_forwardMycoplasmas are bacteria that lack cell walls. On the basis of this structural feature, which statement concerning mycoplasmas should be true? They are gram-negative. They are subject to lysis in hypotonic conditions. They lack a cell membrane as well. They should contain less cellulose than do bacteria that possess cell walls. They possess typical prokaryotic flagella.arrow_forwardWhat is the importance of simple diffusion and osmosis processes for afree-living protozoan microbe like amoebas?arrow_forward
- An organism is a mixotroph loses its plastids, it survives because of which reason; 1. It has an endospore and becomes dormant until conditions improve 2. It has photosynthesis by membranes present in the cytoplasm 3. since it is also a heterotroph engulfs organic material by phagocytosis or by absorption for nutrition 4. uses mitochondria that acquite after loosing its plastidsarrow_forwardIn what ways are Thermoplasma and Picrophilus similar? In whatways do they differ?arrow_forwardA clinical microbiologist is studying a microbe that can cause infections and gastrointestinal disease in humans, and which can also survive and reproduce in mice. A dormant cyst form of the microbe infects human hosts through fecal-oral transmission if they come in contact with mouse droppings and don’t wash their hands before eating. The organism grows in long filaments when grown at 20-28 deg C, and forms round/ovoid cells when grown at temperatures above 28 deg C. Sexual reproduction (fusion of haploid gametes) occurs in both humans and mice. A cell wall is present, and cells contain nuclei. This microbe could be which of the following? Bacterium Fungus Virus Protozoanarrow_forward
- What is the role of oxygen in aerobic respiration? What type(s) of metabolism can occur in the absence of oxygen? Name two enzymes that are present in obligate aerobes but lacking in obligate anaerobes. What is the function of each enzyme Describe the difference between the appearance of surface and subsurface colonies in a pour plate. If this is the same bacterial species, why do these differences in colonial growth occur?arrow_forwardWhy might clinical medicine have an interest in understanding bacterial cell division at the molecular level? Explain why a hyperthermophile would probably not be a human pathogen. Describe four factors that may have an influence on the effectiveness of an antimicrobial treatment. Explain why 70% or 80% alcohol is more effective than 100% alcohol in controlling microorganisms.arrow_forwardwhat are the answers to the questions?arrow_forward
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