BIO 250L Microbiology Midterm Exam {2020} | BIO250L Microbiology Midterm Exam - A Grade

BIO 250L Microbiology Midterm Exam {2020} Question 1 Correct 4.00 points out of 4.00 Flag question Question text Whose work on spontaneous generation first demonstrated the existence of a very heat-resistant form of bacteria that are called endospores? Select one: a. Schwann b. Redi c. Tyndall d. Pasteur Feedback The correct answer is: Tyndall Question 2 Correct 4.00 points out of 4.00 Flag question Question text The most important aspect of agar that makes it a useful ingredient for solidifying media for bacterial culture is Select one: a. It provides an excellent nitrogen source for bacteria. b. Bacteria are unable to break it down so it stays solidified. c. It melts at 100oC and solidifies at temperatures below 50oC. d. It provides an excellent carbon and energy source for bacteria. Feedback The correct answer is: Bacteria are unable to break it down so it stays solidified. Question 3 Correct 4.00 points out of 4.00 Flag question Question text Which of the following best describes the Gram-stain procedure? Select one: a. simple staining b. negative staining c. differential staining d. fluorescent staining Feedback The correct answer is: differential staining Question 4 Correct 4.00 points out of 4.00 Flag question Question text A wide variety of microorganisms are commercially used to manufacture _________ for human consumption. Select one: a. vitamins b. sugars c. fatty acids d. none of the choices Feedback The correct answer is: vitamins Question 5 Correct 4.00 points out of 4.00 Flag question Question text Which of the following is not considered a micronutrient? Select one: a. Manganese (Mn) b. Magnesium (Mg) c. Zinc (Zn) d. Copper (Cu) Feedback The correct answer is: Magnesium (Mg) Question 6 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- Question 37 Correct 4.00 points out of 4.00 Flag question Question text Fungi Select one: a. are eukaryotic organisms. b. produce chlorophyll under aerobic conditions. c. are prokaryotes or eukaryotes, depending on the species. d. produce chlorophyll under aerobic conditions and are prokaryotes or eukaryotes, depending on the species. Feedback The correct answer is: are eukaryotic organisms. Question 38 Correct 4.00 points out of 4.00 Flag question Question text Unlike most enveloped viruses, herpes viruses involve the host __________ membrane in the formation of their envelope. Select one: a. plasma b. nuclear c. mitochondrial d. None of the choices are correct. Feedback The correct answer is: nuclear Question 39 Correct 4.00 points out of 4.00 Flag question Question text In order for bacteriophage to be released from the host by a lysis mechanism, enzymes are required that Select one: a. halt ATP synthesis. b. stabilize the cytoplasmic membrane and cell wall. c. damage the cell wall and cytoplasmic membrane. d. degrade the host chromosome. Feedback The correct answer is: damage the cell wall and cytoplasmic membrane. Question 40 Correct 4.00 points out of 4.00 Flag question Question text Entry of a virus into the lytic cycle after lysogeny has been established is called _________. Select one: a. lysogenic conversion b. lysogenic reversion c. induction d. None of the choices are correct. Feedback The correct answer is: induction