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Ch. 1 - The Microbial World and You
Chapter 1, Problem 10.4a

DRAW IT Use the information in the following table to complete the dichotomous key to these organisms. What is the purpose of a dichotomous key? Look up each genus in Chapter 11, and provide an example of why this organism is of interest to humans.
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1
Understand the purpose of a dichotomous key: It is a tool used to identify organisms based on a series of choices that lead the user to the correct name of a given item.
Examine the table provided in the image to identify the characteristics of each organism that will be used in the dichotomous key.
Start constructing the dichotomous key by creating a series of yes/no questions or statements that differentiate the organisms based on their characteristics.
For each genus mentioned, refer to Chapter 11 to find relevant information about why these organisms are of interest to humans, such as their role in disease, industry, or ecology.
Compile the information into a structured format, ensuring that each step in the dichotomous key leads logically to the next, ultimately identifying each organism.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Dichotomous Key

A dichotomous key is a tool used in biology to identify organisms based on a series of choices that lead the user to the correct name of a given item. Each step in the key presents two contrasting statements about the organism's characteristics, guiding the user through a process of elimination. This systematic approach helps in accurately classifying and understanding biodiversity.
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Genus Identification

In microbiology, the genus is a rank in the biological classification (taxonomy) that groups species sharing common characteristics. Identifying the genus of an organism is crucial for understanding its ecological role, evolutionary relationships, and potential impacts on human health. Each genus can encompass multiple species, each with unique traits and significance.
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Human Interest in Microorganisms

Microorganisms are of significant interest to humans for various reasons, including their roles in health, industry, and the environment. For instance, certain bacteria are essential for digestion, while others can cause diseases. Additionally, microorganisms are used in biotechnology for producing antibiotics, enzymes, and fermented products, highlighting their importance in both health and economic sectors.
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Related Practice
Textbook Question

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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Textbook Question

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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Textbook Question

Which of the following is false about scientific nomenclature?

a. Each name is specific.

b. Names vary with geographical location.

c. The names are standardized.

d. Each name consists of a genus and specific epithet.

e. It was first designed by Linnaeus.

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Textbook Question

You could identify an unknown bacterium by all of the following except

a. hybridizing a DNA probe from a known bacterium with the unknown’s DNA.

b. making a fatty acid profile of the unknown.

c. specific antiserum agglutinating the unknown.

d. ribosomal RNA sequencing.

e. percentage of guanine + cytosine.

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Textbook Question

The wall-less mycoplasmas are considered to be related to gram-positive bacteria. Which of the following would provide the most compelling evidence for this?

a. They share common rRNA sequences.

b. Some gram-positive bacteria and some mycoplasmas produce catalase.

c. Both groups are prokaryotic.

d. Some gram-positive bacteria and some mycoplasmas have coccus-shaped cells.

e. Both groups contain human pathogens.

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Textbook Question

Use the following choices to answer questions 7 and 8.

a. Animalia

b. Fungi

c. Plantae

d. Bacillota (gram-positive bacteria)

e. Pseudomonadota (gram-negative bacteria)


Into which group would you place a multicellular organism that has a mouth and lives inside the human liver?

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