Microbiology questions lec 1-5

Front

Who is known for comparing rRNA sequences to generate the tree of life?

Back

Carl Woese established the three-domain system by comparing rRNA sequences.

Front

What is NOT a function of pili?

Back

Defense by poking holes in other cells is NOT a function of pili.

Front

Why are serial dilutions performed before counting colonies?

Back

To ensure that the colonies are not too numerous to count.

Front

What does the first of Koch's postulates state?

Back

The disease-causing organism must always be present in animals suffering from the disease but not in healthy animals.

Front

What is required to maintain a constant cell population in a chemostat?

Back

Monitoring and controlling nutrient concentrations, dilution rate, and waste products.

Front

What are the three domains of life established by Carl Woese?

Back

Bacteria, Archaea, and Eukarya.

Front

What is the role of pili in bacteria?

Back

Pili are used for cell adhesion, exchange of genetic material, and twitching motility.

Front

What is a chemostat?

Back

A device that maintains a continuous culture of microorganisms by controlling nutrient supply and waste removal.

Front

What is the significance of Koch's postulates in microbiology?

Back

They provide a framework for establishing a causal relationship between a microbe and a disease.

Front

What is the purpose of culturing organisms in pure culture?

Back

To isolate the organism from other microbes for study and identification.