You inoculated a pure culture of unknown bacteria into a tube containing thioglycollate medium to study their metabolic relationship with oxygen. The culture was incubated for an appropriate length of time at the optimal growth temperature of the organism. When you examined the culture, you observed that although the organism grew throughout the medium, the growth was denser at the surface. What would you conclude about the oxygen requirements for this unknown species?ANSWERThe unknown is an obligate anaerobe.The unknown is an obligate aerobe.The unknown is a microaerophile.The unknown is a facultative anaerobe.

An organism that can use gaseous oxygen in metabolism and has the enzymes to process toxic oxygen products is a(n) A. aerobe. B. obligate aerobe. C. facultative anaerobe. D. microaerophile. E. obligate anaerobe.

Which organism is able to live in atmospheric O2?Group of answer choicesObligate anaerobeAerotolerant anaerobeObligate aerobeMicroaerophileobligate aerobe, microaerophile and aerotolerant anaerobeNext

A bacterial strain is grown in nutrient medium at 37 ˚C under aerobic conditions.The medium is inoculated with 102 cells from a seed culture. If the number ofcells in the culture is 105 after 10 hours of growth, the doubling time of the strain(rounded off to nearest integer) is ____________h

A production fermenter has a diameter of 3.66 m and a total liquid volume of 114 m3 . At 1atm, the saturation value of dissolved oxygen is 7 mg l-1 and the variation in oxygendissolution is observed to obey Henry’s law. When oxygen is consumed, 95% is respired ascarbon dioxide and the oxygen transfer rate for this fermentation process is 2 g l-1 h-1 . Thefermenter is operated at a gauge backpressure of 0.68 bar ( i.e. the fermenter is operating at1.68 bara)(a) Assuming 100% oxygen utilisation, calculate the minimum air flow rate required onan STP basis (0°C; 1 bar pressure)

Aerobic metabolism always requires _____.View Available Hint(s)for Part Aoxygencarbon dioxideglucoseexclusion of oxygen