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Microbiology - MB3

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Durchsuche MicrobiologyDurchsuche Biology BereichoderAlle Bereiche erkunden
60 Fragen
Jun 10, 2025

Frage 1

How can microbial growth be estimated?

Antwort

By determining cell nitrogen, cell dry weight, culture turbidity, and culture oxygen consumption.

Frage 2

What is one method to estimate microbial growth?

Antwort

Determining cell nitrogen.

Frage 3

What does culture turbidity indicate?

Antwort

It is one of the methods to estimate microbial growth.

Frage 4

What is the significance of oxygen in obligate aerobes?

Antwort

They require the presence of O2.

Frage 5

What are obligate anaerobes sensitive to?

Antwort

They are sensitive to the presence of O2.

Frage 6

What enzymes are important for oxidative phosphorylation?

Antwort

Catalase, peroxidase, and superoxide dismutase.

Frage 7

What is the catalase test used for?

Antwort

To differentiate aerobic and anaerobic bacteria.

Frage 8

What happens to bacteria with the catalase enzyme when exposed to hydrogen peroxide?

Antwort

They are sensitive to hydrogen peroxide.

Frage 9

What do facultative anaerobes require?

Antwort

They can grow in the presence or absence of O2.

Frage 10

What is the role of catalase in bacteria?

Antwort

It breaks down hydrogen peroxide.

Frage 11

How do obligate anaerobes react to hydrogen peroxide?

Antwort

They do not have catalase and are negative to the catalase test.

Frage 12

What is a characteristic of facultative anaerobes?

Antwort

They are positive for catalase.

Frage 13

What does the presence of catalase indicate?

Antwort

It indicates the ability to break down hydrogen peroxide.

Frage 14

What type of bacteria does not have catalase?

Antwort

Obligate anaerobes.

Frage 15

What is the effect of hydrogen peroxide on obligate anaerobes?

Antwort

They are negatively affected as they lack catalase.

Frage 16

What is a common feature of obligate aerobes?

Antwort

They require oxygen for growth.

Frage 17

What type of bacteria can grow with or without oxygen?

Antwort

Facultative anaerobes.

Frage 18

What is the relationship between catalase and hydrogen peroxide?

Antwort

Catalase breaks down hydrogen peroxide.

Frage 19

What type of bacteria is sensitive to H2O2?

Antwort

Obligate aerobes.

Frage 20

What does the term 'oxidative phosphorylation' refer to?

Antwort

A process involving enzymes like catalase.

Frage 21

What is the outcome of the catalase test for aerobic bacteria?

Antwort

They are positive for catalase.

Frage 22

What do facultative anaerobes produce in the presence of oxygen?

Antwort

They produce catalase.

Frage 23

What is a negative result in the catalase test indicative of?

Antwort

It indicates the absence of catalase, typical of obligate anaerobes.

Frage 24

What is the function of superoxide dismutase?

Antwort

It helps in the detoxification of superoxide radicals.

Frage 25

What type of bacteria are obligate aerobes?

Antwort

Bacteria that require oxygen.

Frage 26

What do you call bacteria that can survive without oxygen?

Antwort

Facultative anaerobes.

Frage 27

What is a key characteristic of obligate anaerobes?

Antwort

They cannot survive in the presence of oxygen.

Frage 28

What does the presence of superoxide dismutase indicate?

Antwort

It indicates the ability to detoxify superoxide radicals.

Frage 29

What is the role of peroxidase in bacteria?

Antwort

It helps in breaking down hydrogen peroxide.

Frage 30

What is a defining trait of facultative anaerobes regarding oxygen?

Antwort

They can grow in both the presence and absence of oxygen.

Frage 31

What is the effect of hydrogen peroxide on facultative anaerobes?

Antwort

They are generally resistant due to catalase.

Frage 32

What is the significance of the catalase enzyme?

Antwort

It protects bacteria from oxidative damage.

Frage 33

What type of bacteria is not affected by hydrogen peroxide?

Antwort

Facultative anaerobes due to their catalase.

Frage 34

What is the outcome of the catalase test for obligate anaerobes?

Antwort

They are negative for catalase.

Frage 35

What is the relationship between obligate aerobes and oxygen?

Antwort

They need oxygen to grow.

Frage 36

What does the presence of oxygen indicate for obligate aerobes?

Antwort

It indicates a suitable environment for growth.

Frage 37

What is the role of oxygen in microbial growth?

Antwort

It is essential for obligate aerobes.

Frage 38

What is the function of the catalase enzyme in aerobic bacteria?

Antwort

It breaks down hydrogen peroxide into water and oxygen.

Frage 39

What type of bacteria can tolerate the presence of oxygen?

Antwort

Facultative anaerobes.

Frage 40

What is a common feature of obligate anaerobes?

Antwort

They lack the enzymes to break down hydrogen peroxide.

Frage 41

What is the significance of the catalase test in microbiology?

Antwort

It helps classify bacteria as aerobic or anaerobic.

Frage 42

What is the effect of hydrogen peroxide on aerobic bacteria?

Antwort

They can break it down due to catalase.

Frage 43

What type of bacteria is catalase positive?

Antwort

Aerobic bacteria.

Frage 44

What is the relationship between facultative anaerobes and catalase?

Antwort

They are catalase positive.

Frage 45

What do obligate anaerobes lack?

Antwort

They lack catalase.

Frage 46

What is the role of enzymes in microbial growth?

Antwort

They facilitate metabolic processes.

Frage 47

What is a characteristic of facultative anaerobes regarding oxygen?

Antwort

They can switch between aerobic and anaerobic metabolism.

Frage 48

What is the effect of oxygen on obligate anaerobes?

Antwort

It is harmful to them.

Frage 49

What is the importance of chemical requirements in microbial growth?

Antwort

They are essential for metabolic functions.

Frage 50

What do you call bacteria that thrive in the presence of oxygen?

Antwort

Obligate aerobes.

Frage 51

What is the impact of hydrogen peroxide on facultative anaerobes?

Antwort

They can detoxify it due to catalase.

Frage 52

What is the outcome for obligate anaerobes in the presence of oxygen?

Antwort

They cannot survive.

Frage 53

What is the role of oxygen in oxidative phosphorylation?

Antwort

It acts as the final electron acceptor.

Frage 54

What is the significance of superoxide dismutase in bacteria?

Antwort

It protects against oxidative stress.

Frage 55

What do you call bacteria that can live without oxygen?

Antwort

Anaerobes.

Frage 56

What is a defining feature of aerobic bacteria?

Antwort

They require oxygen for growth.

Frage 57

What is the relationship between catalase and hydrogen peroxide?

Antwort

Catalase decomposes hydrogen peroxide.

Frage 58

What is a common characteristic of facultative anaerobes?

Antwort

They can adapt to different oxygen levels.

Frage 59

What is the effect of hydrogen peroxide on aerobic bacteria?

Antwort

They can break it down safely.

Frage 60

What do obligate anaerobes do in the absence of oxygen?

Antwort

They thrive and grow.

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