22 Questions
Which of the following forms of oxygen is toxic and highly reactive?
Singlet oxygen
What is the primary function of superoxide dismutases in aerobes?
To detoxify superoxide radicals
Which of the following enzymes do obligate anaerobes lack or have in small amounts?
Both catalase and peroxidase
What is the primary function of carotenoids in phototropic organisms?
To remove excess energy from singlet oxygen
Which of the following forms of oxygen is formed during reactions catalyzed by superoxide dismutase?
Peroxide anion
What is the primary function of catalase and peroxidase enzymes in aerobes?
To detoxify peroxide anion
What type of culture medium is used to differentiate between microorganisms based on their ability to ferment certain carbohydrates?
Differential medium
Which type of culture medium is used to support the growth of microorganisms that require specific nutrients or growth factors?
Defined medium
What type of culture medium is used to support the growth of microorganisms that require low oxygen levels?
Anaerobic medium
Which type of culture medium contains a complex mixture of nutrients, such as peptone, yeast extract, and meat extract?
Complex medium
What type of culture medium is used to inhibit the growth of unwanted microorganisms and allow the growth of a specific target organism?
Selective medium
Which type of culture medium is used to maintain the viability of microorganisms during transportation?
Transport medium
What type of culture medium is used to determine the metabolic capabilities of microorganisms?
Differential medium
Which type of culture medium is used to support the growth of microorganisms that require a specific set of nutrients?
Defined medium
What type of culture medium is used to inhibit the growth of aerobic microorganisms and support the growth of anaerobic microorganisms?
Anaerobic medium
Which type of culture medium is used to support the growth of a wide range of microorganisms?
Complex medium
What is the result of microbial growth?
An aggregation of cells arising from a single parent cell
What do autotrophs use as a source of carbon?
Carbon dioxide
Which group of organisms acquires energy from redox reactions involving inorganic and organic chemicals?
Chemotrophs
Why is oxygen deadly for obligate anaerobes?
Because it is the final electron acceptor in the Electron Transport Chain (ETC)
What is the primary function of nutrients in microbial growth?
To build organic molecules and cellular structures
Which group of organisms uses light as their primary energy source?
Autotrophs
Test your knowledge on the hydroxyl radical, a highly reactive form of oxygen, and growth requirements for organisms. Explore concepts related to ionizing radiation, reduction of hydrogen peroxide, and nutrient needs for growth.
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