Microbiology with Diseases by Body System Plus MasteringMicrobiology with eText -- Access Card Package (4th Edition)
4th Edition
ISBN: 9780321918383
Author: Robert W. Bauman Ph.D.
Publisher: PEARSON
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Chapter 4, Problem 2TMW
Why is a Gram-negative bacterium colorless but a Gram-positive bacterium purple after it is rinsed with decolorizer?
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Chapter 4 Solutions
Microbiology with Diseases by Body System Plus MasteringMicrobiology with eText -- Access Card Package (4th Edition)
Ch. 4 - Prob. 1TMWCh. 4 - Why is a Gram-negative bacterium colorless but a...Ch. 4 - Why didnt Linnaeus create taxonomic groups for...Ch. 4 - Necrotizing Fasciitis Fever, chills, nausea,...Ch. 4 - Why is magnification high and color absent in an...Ch. 4 - Prob. 1MCCh. 4 - Prob. 2MCCh. 4 - Prob. 3MCCh. 4 - Curved glass lenses _________ light. a. refract b....Ch. 4 - Prob. 5MC
Ch. 4 - Prob. 6MCCh. 4 - Prob. 7MCCh. 4 - Prob. 8MCCh. 4 - Prob. 9MCCh. 4 - In the binomial system at nomenclature, which term...Ch. 4 - Prob. 1FIBCh. 4 - Prob. 2FIBCh. 4 - Prob. 3FIBCh. 4 - Fill in the Blanks 4. ___________ refers to...Ch. 4 - Fill in the Blanks 5. Cationic chromophores such...Ch. 4 - Prob. 1VICh. 4 - Label the microscope.Ch. 4 - Prob. 1SACh. 4 - Critique the following definition of magnification...Ch. 4 - Prob. 3SACh. 4 - Put the following substances in the order they are...Ch. 4 - Prob. 5SACh. 4 - Prob. 6SACh. 4 - Prob. 7SACh. 4 - Prob. 8SACh. 4 - Miki came home from microbiology lab with green...Ch. 4 - Why is the definition of species as successfully...Ch. 4 - With the exception of the discovery of new...Ch. 4 - Prob. 4CTCh. 4 - Prob. 5CTCh. 4 - In what ways are the Gram stain and the acid-fast...Ch. 4 - Prob. 7CTCh. 4 - Prob. 8CTCh. 4 - Why is the genus name Coccus placed within...Ch. 4 - A clinician obtains a specimen of urine from a...Ch. 4 - Using the following terms, fill in the following...
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- The acid-fast bacterium, Mycobacterium smegmatis, is relatively safe to be used by students in performing the acid-fast stain technique because of its thin cell wall. However, if this organism is used for Gram-stain, it can also take the Gram stain reaction. Why is this so?arrow_forwardwhat effect would failing to drain the smear in-between staining have on your judgment of the gram reaction of an organism?arrow_forwardThe acid fast bacterium, Mycobacterium smegmatis, is relatively safe for students to work with because of its thin cell wall. If a gram stain is to be performed on this particular microbe, it often takes the gram stain reaction. Why?arrow_forward
- What would be the color of gram positive and negative bacteria if: crystal violet was replaced with methylene blue? Gram positive – Gram negative – mordant was skipped? Gram positive – Gram negative – decolorizing step was omitted? Gram positive – Gram negative – counterstain was not used? Gram positive – Gram negative –arrow_forwardAbout the Gram staining technique, explain: What is the purpose of using lugol and alcohol in this type of coloring?arrow_forwardwhat is oil immersion and why is it usedarrow_forward
- Considering you can’t identify bacteria from a Gram stain, why might a physician perform a Gram stain on a sample before prescribing an antibiotic?arrow_forwardWhen is sterilization by filtration preferred over sterilization by heat? Why? What makes heat an effective sterilizing agent? Why are the conditions required for sterilization greater for dry heat (160-180°C for 1-2hrs) than for steam (121°C for 15min)?arrow_forwardHow can polarography detect the analyte?arrow_forward
- Describe one error in the staining procedure that would result in a Gram-positive bacterium appearing pink.arrow_forwardExplain why only gram-negative cells undergo decolorization during the gram staining procedure. Cite the purpose of each of the following reagents in a differential staining procedure. Primary stain Mordant Decolorizing Agent Counter stain What might happen if the Gram staining procedure is performed on a culture incubated for a little over a dayarrow_forwardWhat is the function of the mordant used in the Gram staining procedure? If the iodine step is skipped, what color are Gram-negative cells observedarrow_forward
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