BIO250 - Straighter line microbiology study set Final exam ACTUAL EXAM QUESTIONS WITH COMPLETE SOLUTION GUIDE (A+ GRADED 100% VERIFIED) LATEST VERSION 2025!!

What microbial process transformed Earth's atmosphere from one lacking oxygen to one rich in oxygen? (ANSWER) Oxygenic photosynthesis In the nitrogen cycle, which phase is responsible for the release of nitrogen in the form of N2? (ANSWER) Denitrification In the secondary treatment phase of wastewater management, why is air introduced into the sludge while it is being mixed and recirculated? (ANSWER) The bioremediatory requires oxygen Which of the following microorganisms is utilized in yogurt production? (ANSWER) Lactobacillus bulgaricus ATP is a (ANSWER) Nucleotide that both stores and releases energy within the cell A viral capsid consists of (ANSWER) Proteins Which of the following is NOT classified as a living organism? (ANSWER) Viruses Which of these accurately describes the sequence of RNA types involved in translation? (ANSWER) Messenger RNA (mrna), transfer RNA (trna), Ribosomal RNA (rrna) What bacterial identification method, when positive, results in the bacterium being stained in two contrasting colors? (ANSWER) Gram staining Which of the following is present in some but not all groups of eukaryotic microorganisms? (ANSWER) Cell wall Under what circumstances would a researcher refer to Bergey's manual of systematic bacteriology rather than Bergey's manual of determinative bacteriology? (ANSWER) To explore the genetic lineage of bacterial species Which of the following structures is found in gram-negative bacteria but not in gram-positive bacteria? (ANSWER) Outer lipid membrane Which type of archaea can thrive in highly saline environments? (ANSWER) Halophiles Which statement is applicable to prokaryotes but not eukaryotes? (ANSWER) They possess cell walls made of peptidoglycan What is the function of ribosomes? (ANSWER) They provide a site for protein synthesis Which of the following are believed to be the ancestors of chloroplasts? (ANSWER) Cyanobacteria Which eukaryotic microorganisms are classified as photoautotrophs? (ANSWER) Algae Describe the genetic material found within a virus. (ANSWER) RNA or DNA, but not both In the life cycle of an animal virus, what happens during the adsorption phase? (ANSWER) The virus attaches to receptor sites on the surface of the host cell Which viral enzyme is responsible for converting viral RNA into DNA? (ANSWER) Reverse transcriptase A bacteriophage is classified as what type of microorganism? (ANSWER) Virus What is the primary role of a microbe's cell membrane, also known as the cytoplasmic membrane? (ANSWER) It facilitates the transport of nutrients in and waste out The outer layer of a virus is referred to as the (ANSWER) Capsid