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What microbial process was responsible for changing Earth's atmosphere from one without oxygen to one with oxygen? Oxygenic photosynthesis 2. In the nitrogen cycle, which of the following phases involves the release of Nitrogen into the Earth's atmosphere? Denitrification 3. Farmers commonly...

Who of the following provided the evidence needed to discredit the concept of spontaneous generation? Select one: a. Pasteur b. Koch c. Semmelweiss d. Lister The concept that human and animal diseases are caused by microorganisms is called the Select one: a. cell theory. b. germ theory. ...

Which of the following is not true of chloramines? Select one: a. Contains chlorine b. Can sanitize and disinfect c. Form trihalomethanes with organic compounds d. Is safer than free chlorine e. Treats wounds and skin surfaces Feedback The correct answer is: Form trihalomethanes with organic...

In the nitrogen cycle, which of the following steps involves removal of nitrogen from the atmosphere by bacteria? a. Ammonification b. Denitrification c. Nitrification d. Nitrogen fixation Answer is d. In nitrogen fixation, nitrogen is removed from the atmosphere by nitrogen-fixing bacteria a...

The sum total of all the microbes in a certain environment is termed the______ Select one: a. biofilm b. microbial niche c. microbiome d. phylogeny e. domain: Microbiome 2. Studies of the immune response to an infection caused by microorganisms would be performed by a/an _______. Select on...