Microbiology Fundamentals: A Clinical Approach
Microbiology Fundamentals: A Clinical Approach
3rd Edition
ISBN: 9781260163698
Author: Cowan
Publisher: MCG
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Chapter 2, Problem 19Q
Summary Introduction

Introduction:

Gram staining produces two types of effect in bacteria that are a positive effect and negative effect. If the obtained result shows a red-colored cell, it means that the cell is Gram-positive and if the cell is violet colored, then the cell is Gram-negative.

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Which of the following describes the usefulness of a Gram stain.  Select all that apply. a. A Gram stain can be used to check for bacteria at the site of a suspected infection or in certain body fluids, such as blood or urine.   b. A Gram stain can be used to determine whether penicillin will be effective at treating the patient or whether a different antibiotic should be used.   c. A Gram stain can determine whether the bacteria have a thick or thin layer of peptidoglycan in their cell wall.
Which of the following can be used to distinguish one colony from another on an agar plate?  Select all that apply. a. Shape b. Color c. Gram stain d. Cell arrangement e. Size f. Elevation g. Margin h. Texture
Explain how bacterial cells would look in the gram staining procedure if the following mistakes were made: a. Decolorizer left on too long b. Decolorizer not left on long enough c. Slide not heat-fixed before staining

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Microbiology Fundamentals: A Clinical Approach

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