BIO 250 | Micro Test 2 Exam Questions with Correct Answers Latest Graded A+ Straighterline

BIO 250 Micro Test 2 Exam Questions with Answers Latest Graded A+ Straighterline Studies by Emil von Behring and Shibasaburo Kitasato demonstrated that inactivated toxins can induce the synthesis of antitoxins in the blood of rabbits. These antitoxins (antibodies) are the basis of Select one: a. humoral immunity. Correct b. cell-mediated immunity. c. antibiotic immunity. d. phagocyte-mediated immunity. Feedback The correct answer is: humoral immunity. Question 2 Correct 4.50 points out of 4.50 Not flaggedFlag 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 Correct d. Pasteur Feedback The correct answer is: Tyndall Question 3 Correct 4.50 points out of 4.50 Not flaggedFlag question Question text Which of the following distinguish the field of microbiology from other fields of biology? Select one: a. The size of the organism studied. b. The techniques used to study organisms regardless of their size. c. Both the size of the organism studied and the techniques employed in the study of organisms. Correct d. Neither the size of the organism studied nor the techniques employed in the study of organisms regardless of their size. Feedback The correct answer is: Both the size of the organism studied and the techniques employed in the study of organisms. Question 4 Correct 4.50 points out of 4.50 Not flaggedFlag question Question text Three the SSU rRNA sequences of 3 organisms have been compared. For organisms 1 and 2, two of the twelve nucleotides in the sequence are different. For organisms 1 and 3, six of the twelve nucleotides are different. Which organism has greater evolutionary distance from organism 1? Select one: a. Organism 2 b. Organism 3 Correct c. The evolutionary distance is the same. d. Evolutionary distance cannot be predicted from this data. Feedback The correct answer is: Organism 3 Question 5 Correct 4.50 points out of 4.50 Not flaggedFlag question Question text Protists contain all of the following forms of life EXCEPT Select one: a. protozoa. b. fungi. Correct c. slime molds. d. algae. Feedback The correct answer is: fungi. Question 6 Correct 4.50 points out of 4.50 Not flaggedFlag question Question text A new microbe has been discovered in the rumen of sheep. Microscopy shows no evidence of a nuclear membrane and biochemical studies of the cell wall demonstrate the lack of peptidoglycan. Metabolic studies show that this microbe generates methane. This microbe would most likely be classified in the: Select one: a. Domain Bacteria b. Domain Archaea Correct c. Domain Eukarya, Kingdom Fungi d. Domain Eukarya, Protists Feedback The correct answer is: Domain Archaea Question 7 Correct 4.50 points out of 4.50 Not flaggedFlag question Question text The ribosomal RNA studies that led to the division of prokaryotic organisms into the Bacteria and the Archaea were begun by Select one: a. Pasteur. b. Woese. Correct c. Needham. d. Watson. Feedback The correct answer is: Woese. Question 8 Correct 4.50 points out of 4.50 Not flaggedFlag question Question text What is the most compelling reason why “protists” are not considered to be a taxonomic group? Select one: a. They are not cellular life forms. b. They are too small to be included among the eukaryotes. c. The group includes both prokaryotic and eukaryotic cell types. d. The organisms often included in this group are very diverse and don’t form a cohesive taxon. Correct Feedback The correct answer is: The organisms often included in this group are very diverse and don’t form a cohesive taxon. Question 9 Correct 4.50 points out of 4.50 Not flaggedFlag question Question text If immersion oil was replaced with water, what would happen? Select one: a. The refractive index would increase, improving resolution. b. The refractive index of water would be greater than air but less than oil, improving resolution less than oil. Correct c. The refractive index of water would be less than that of air, decreasing resolution. d. There would be no difference. Feedback The correct answer is: The refractive index of water would be greater than air but less than oil, improving resolution less than oil. Question 10 Correct 4.50 points out of 4.50 Not flaggedFlag question Question text A 30× objective and a 20× ocular produce a total magnification of Select one: a. 230×. b. 320×. c. 50×. d. 600×. Correct Feedback The correct answer is: 600×. Question 11 Incorrect 0.00 points out of 4.50 Not flaggedFlag question Question text As the resolution of a microscope system improves, the size of the smallest object that can be seen clearly Select one: a. is larger. b. is smaller. c. is not affected. Incorrect Feedback The correct answer is: is smaller. Question 12 Incorrect 0.00 points out of 4.50 Not flaggedFlag question Question text