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Mycobacteria Quiz

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Questions and Answers

Explain the significance of acid-fastness in the identification of Mycobacteria.

Acid-fastness is significant in the identification of Mycobacteria because they possess a unique resistance to decolorization by acid solutions due to the presence of mycolic acids in their cell wall. This property is used for staining purposes and is crucial in their identification.

What is the composition of the cell wall of Mycobacteria and how does it contribute to their characteristics?

The cell wall of Mycobacteria contains mycolic acids with a high carbon content (70 to 90 carbons), which is a defining feature contributing to their resistance against detergents, antibiotics, and immune responses.

Describe the colonial morphology and growth characteristics of the M. tuberculosis complex.

The M. tuberculosis complex species are slow-growing and form nonpigmented colonies.

What is the significance of the high G + C content in mycobacterial DNA?

<p>The high guanine plus cytosine (G + C) content in mycobacterial DNA (61% to 71% mol) is a characteristic feature aiding in their genetic differentiation.</p> Signup and view all the answers

What are the distinct characteristics of Mycobacteria that aid in their identification and classification?

<p>The distinct characteristics include acid-fastness, cell wall composition rich in mycolic acids, high G + C content in DNA, and specific colonial morphology and growth characteristics.</p> Signup and view all the answers

Flashcards

Acid-fastness

Unique resistance of Mycobacteria to acid decolorization due to mycolic acids in their cell wall.

Mycolic acids

Fatty compounds in Mycobacteria's cell wall that contribute to their unique properties.

Colonial morphology of M. tuberculosis

M. tuberculosis complex forms slow-growing, nonpigmented colonies.

High G + C content

Mycobacterial DNA has 61% to 71% guanine and cytosine, aiding genetic differentiation.

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Identification characteristics of Mycobacteria

Include acid-fastness, mycolic acid-rich cell wall, high G + C content, and specific colony morphology.