BIO 250 Microbiology Final Exam 60 Questions with Correct Answers

What microbial process was responsible for changing Earth's atmosphere from one without oxygen to one with oxygen? - · Oxygenic photosynthesis In the nitrogen cycle, which of the following phases involves the release of nitrogen as N2 into the Earth's atmosphere? - · Denitrification Farmers commonly inoculate legume crops with Rhizobium bacteria for which of the following purposes? - · The two form a symbiotic relationship increasing the plant's access to nitrogen. In the secondary phase of wastewater treatment, why is air injected into the sludge as it is stirred and recirculated? - · The bioremediators need oxygen. Which of the following microorganisms is used to make yogurt? - · Lactobacillus bulgaricus ATP is a: - · Nucleotide that releases and stores energy in the cell. A viral capsid is composed of - · Proteins. Which of these are NOT considered living organisms? - Viruses