Microbiology Discoveries: Robert Koch and Ferdinand Cohn

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What did Cohn's discovery about boiling and sterilization suggest?

Boiling was an effective means of sterilization

Boiling was an unreliable method of sterilization (correct)

Boiling killed only the vegetative cells, not the endospores

Boiling killed all forms of Bacillus bacteria

What did Pasteur's experiments demonstrate about the origins of microorganisms in decaying matter?

Microorganisms in decaying matter arise from contamination of the food

Microorganisms spontaneously generate in decaying matter

Microorganisms in decaying matter come from the air (correct)

Microorganisms in decaying matter have no relation to those in the air

What was the key contribution of Robert Koch to microbiology?

Developing the endospore formation process

Developing criteria to prove the cause of a disease (correct)

Disproving the theory of spontaneous generation

Discovering the genus Bacillus

What was the significance of Pasteur's swan-necked flask experiment?

All of the above Signup and view all the answers

What was the impact of the progress in microbiology during the 19th century?

Pure culture microbiology became the dominant approach Signup and view all the answers

Which of the following was NOT a key contribution of Louis Pasteur to microbiology?

Developing criteria to prove the cause of a disease Signup and view all the answers

Which scientist is credited with obtaining the first pure cultures of many soil and waterborne microorganisms using the enrichment culture technique?

Martinus Beijerinck Signup and view all the answers

Which of the following is NOT one of the key principles of Koch's postulates for establishing the causative relationship between a microorganism and a disease?

The microorganism must be able to spontaneously generate from non-living matter. Signup and view all the answers

Which scientist is credited with proposing the term 'chemolithotrophy' to describe the relationship between the oxidation of inorganic substances and energy production?

Sergei Winogradsky Signup and view all the answers

Which scientist is credited with explaining the basic principles of virology by showing that the infectious agent responsible for tobacco mosaic disease was not a bacterium, but a new type of infectious agent that needed a living host to multiply?

Martinus Beijerinck Signup and view all the answers

Which scientist is credited with disproving the theory of spontaneous generation and establishing that microorganisms can only arise from pre-existing microorganisms?

Louis Pasteur Signup and view all the answers

Which scientist is credited with developing the Koch's postulates, a set of four criteria used to establish a causative relationship between a microorganism and a disease?

Robert Koch Signup and view all the answers

Which of the following was a major challenge in growing the tuberculosis bacterium in the laboratory?

The bacterium contained high amounts of a waxy lipid in its cell wall Signup and view all the answers

What technique did Robert Koch develop to observe the tuberculosis bacterium in lung tissue samples?

He used a new staining procedure to make the bacteria visible Signup and view all the answers

What was the significance of Robert Koch's discovery of the tuberculosis bacterium?

It was recognized with the Nobel Prize in Physiology or Medicine Signup and view all the answers

Which two scientists are described as pioneering the transition to sub-branches of microbiology?

Martinus Beijerinck and Sergei Winogradsky Signup and view all the answers

What was a key challenge faced by Robert Koch in culturing the tuberculosis bacterium?

Obtaining pure cultures of the bacterium was not easy Signup and view all the answers

Microbiology Discoveries: Robert Koch and Ferdinand Cohn

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