Microbiology at University Of The Sunshine Coast | Flashcards & Summaries

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Lernmaterialien für Microbiology an der University of the Sunshine Coast

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The oldest fossils that are eukaryotic are how old?

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about 1.7 billion years old.

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The establishment of DNA as the genome of the cell may have resulted from?


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the need to store genetic information in a more stable form.

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What is an oligotroph? 

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any organism, which can grow in relatively nutrient-poor environments. 

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What are two purposes for a pre-enrichment medium?


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1. Damaged cells are given time and the necessary nutrients to repair and grow (this step is important because direct inoculation of a sample into a selective enrichment medium may result in the death of some bacteria). 
2. To increase the number of cells (This step is crucial when trying to enumerate low numbers of a target organism in environmental samples).

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What is an Elective enrichment medium?

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It allows the growth of a single or limited type of bacteria based on a unique combination of nutritional or physiological attributes. 

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What is Selective enrichment medium?

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It involves the use of inhibitory substances or conditions to suppress or inhibit the growth of most organisms while allowing the growth of the desired organism. 

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What is a fastidious heterotroph?

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microorganisms with an elaborate requirement for specific nutrients such as vitamins 
and other growth promoting substances.

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Facultatively anaerobic bacteria grow in?

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either the absence or presence of free oxygen (can grow without oxygen but use oxygen if it is present). 

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Microaerophilic bacteria grow in?


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the presence of minute quantities of free oxygen?

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For most bacteria, the optimum pH for growth lies between?


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6.5 - 7.5

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obligate halophilic bacteria grow only when the medium contains?


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an unusually high concentration of salt (10 to 15%).

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What are Stromatolites?
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Fossilized microbial mats consisting of layers of filamentous prokaryotes and trapped sediment.
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Beispielhafte Karteikarten für deinen Microbiology Kurs an der University of the Sunshine Coast - von Kommilitonen auf StudySmarter erstellt!

Q:

The oldest fossils that are eukaryotic are how old?

A:

about 1.7 billion years old.

Q:

The establishment of DNA as the genome of the cell may have resulted from?


A:

the need to store genetic information in a more stable form.

Q:

What is an oligotroph? 

A:

any organism, which can grow in relatively nutrient-poor environments. 

Q:

What are two purposes for a pre-enrichment medium?


A:

1. Damaged cells are given time and the necessary nutrients to repair and grow (this step is important because direct inoculation of a sample into a selective enrichment medium may result in the death of some bacteria). 
2. To increase the number of cells (This step is crucial when trying to enumerate low numbers of a target organism in environmental samples).

Q:

What is an Elective enrichment medium?

A:

It allows the growth of a single or limited type of bacteria based on a unique combination of nutritional or physiological attributes. 

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Q:

What is Selective enrichment medium?

A:

It involves the use of inhibitory substances or conditions to suppress or inhibit the growth of most organisms while allowing the growth of the desired organism. 

Q:

What is a fastidious heterotroph?

A:

microorganisms with an elaborate requirement for specific nutrients such as vitamins 
and other growth promoting substances.

Q:

Facultatively anaerobic bacteria grow in?

A:

either the absence or presence of free oxygen (can grow without oxygen but use oxygen if it is present). 

Q:

Microaerophilic bacteria grow in?


A:

the presence of minute quantities of free oxygen?

Q:

For most bacteria, the optimum pH for growth lies between?


A:

6.5 - 7.5

Q:

obligate halophilic bacteria grow only when the medium contains?


A:

an unusually high concentration of salt (10 to 15%).

Q:
What are Stromatolites?
A:
Fossilized microbial mats consisting of layers of filamentous prokaryotes and trapped sediment.
Microbiology

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