Which of the following is a form of toxic oxygen?

• Diatomic oxygen

• Superoxide radical (O2-)

• Ozone

• Water

Which of the following organisms have the catalase enzyme?

• Obligate Aerobes

• Facultative Anaerobes

• Aerotolerant Anaerobes

• Obligate Anaerobes

Which enzyme is responsible for the conversion of hydrogen peroxide to water in aerotolerant anaerobes?

• Catalase

• Peroxidase

• Superoxide dismutase

• NADH

Which group of organisms has an optimal growth temperature at human body temperature?

• Psychrophiles

• Mesophiles

• Thermophiles

• Extreme Thermophiles

Which type of organism grows best at temperatures above 80°C?

• Psychrophiles

• Mesophiles

• Thermophiles

• Extreme Thermophiles

Which of the following requires the highest concentration of NaCl?

• Extreme Halophile

• Obligate Halophile

• Facultative Halophile

• Halotolerant

Which type of halophile can survive without any NaCl?

• Extreme Halophile

• Obligate Halophile

• Facultative Halophile

• Halotolerant

Which of the following is a type of nutritional group that uses light as an energy source and carbon dioxide as a carbon source?

• Chemoautotrophs

• Photoautotrophs

• Photoheterotrophs

• Chemoheterotrophs

Which nutritional group uses light as an energy source but obtains carbon from organic compounds?

• Photoautotrophs

• Chemoautotrophs

• Photoheterotrophs

• Chemoheterotrophs

What type of organism uses carbon dioxide as a carbon source but obtains energy from redox reactions

• photoautotrophs

• chemoautotrophs

• photoheterotrophs

• chemoheterotrophs