Microbiology: An Evolving Science (Fourth Edition)
Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 18, Problem 4TQ
Summary Introduction

To review:

The different species of microbes grow together in the given layered biofilms that are on the sand flat and surface of human teeth.

Introduction:

A biofilm is an association comprising of various microorganisms that are dependent on each other for their survival and nutrition. The microbes are attached to a polysaccharide matrix. This matrix comprises organic and inorganic substances. The microbial community is bound to the surface of teeth and non-sheddable surface. The biofilm formation is avoided to prevent conditions like dental plaque which further causes oral diseases. It also affects water quality.

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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 cells
Bacterial growth depends on many environmental factors, including the temperature of the environment. Since microbes can survive in a certain range of temperatures and will thrive at a temperature, understanding these variables allows for control of their growth. This understanding can be used, for example, to preserve certain foods or to treat infections. This lab simulation will use an instrument called a spectrophotometer. This instrument quantitatively measures the amount of light that is absorbed or transmitted by molecules in solution a) In your own words give an introduction to the microbial growth and the effect tempature has. b) In your own words explain the importance of the spectrophotometer in regards to microbial growth. c) In your own words give a hypothesis on how bacteria will react to different temperatures.
(a) Distinguish between biofilms and microbial mats and describe their relative significance. (b) Describe two methods, one that employs PCR and the other that does not, used to identify microorganisms by the molecular characteristics of their 16S FRNA. 3. (c) How do microorganisms enhance corrosion of metal and concrete surfaces?
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