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Ch. 10 - Classification of Microorganisms
Tortora - Microbiology: An Introduction 14th Edition
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTortora 14th EditionCh. 10 - Classification of MicroorganismsProblema 2
Capitolo 6, Problema 2

Bacillus and Lactobacillus are not in the same order. This indicates that which one of the following is not sufficient to assign an organism to a taxon?
a. Biochemical characteristics
b. Amino acid sequencing
c. Phage typing
d. Serology
e. Morphological characteristics

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1
Understand that taxonomic classification in microbiology is based on multiple criteria, including genetic, biochemical, morphological, and serological characteristics.
Recognize that Bacillus and Lactobacillus belong to different orders, meaning they are classified at a higher taxonomic level based on significant differences.
Consider that morphological characteristics (such as shape and staining) can sometimes be similar between different genera or orders, which may lead to misclassification if used alone.
Evaluate the options given: biochemical characteristics, amino acid sequencing, phage typing, serology, and morphological characteristics, and determine which method alone might not be sufficient to accurately assign an organism to the correct taxon.
Conclude that morphological characteristics alone are often not sufficient for precise taxonomic assignment because different organisms can share similar shapes or structures despite being genetically distinct.

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Taxonomic Classification and Hierarchy

Taxonomy organizes organisms into hierarchical groups like domain, kingdom, phylum, class, order, family, genus, and species. Organisms in different orders have significant genetic and evolutionary differences, so accurate classification requires multiple lines of evidence beyond superficial traits.
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Hierarchy of Microbial Growth Control Terminology

Limitations of Morphological Characteristics in Classification

Morphological characteristics refer to the physical traits of organisms, such as shape and structure. While useful for initial identification, these traits can be misleading due to convergent evolution or phenotypic plasticity, making morphology alone insufficient for precise taxonomic placement.
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Types of Bacterial Cell Morphology

Molecular and Biochemical Methods in Taxonomy

Techniques like amino acid sequencing, biochemical tests, serology, and phage typing analyze genetic or molecular features, providing more reliable data for classification. These methods help distinguish organisms with similar morphology but different evolutionary backgrounds.
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Introduction to Taxonomy
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Which of the following is used to classify organisms into the Kingdom Fungi?

a. Ability to photosynthesize; possess a cell wall

b. Unicellular; possess cell wall; prokaryotic

c. Unicellular; lacking cell wall; eukaryotic

d. Absorptive; possess cell wall; eukaryotic

e. Ingestive; lacking cell wall; multicellular; prokaryotic

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Here is some additional information on the organisms in question 1:

Which of these organisms are most closely related? Compare this answer with your response to review question 1.

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Which of the following organisms are most closely related? Are any two the same species? On what did you base your answer?

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Bergey’s Manual of Systematics of Archaea and Bacteria differs from Bergey’s Manual of Determinative Bacteriology in that the former

a. Groups bacteria into species

b. Groups bacteria according to phylogenetic relationships

c. Groups bacteria according to pathogenic properties

d. Groups bacteria into 19 species

e. All of the above

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DRAW IT Use the following rRNA information to construct a cladogram for some of the organisms used in question 4. What is the purpose of a cladogram? How does your cladogram differ from a dichotomous key for these organisms?

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