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MIC 101 Exam 1 Winter 2013

Positive chemotaxis is biased random movement toward

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35. Positive Chemotaxis is Biased Random Movement toward a Chemical or Stimulus. Which of the Following is the most Correct Description of this Biased Random Movement involved in Positive Chemotaxis for E. coli ? A. The Duration of the Clockwise Rotation of the Amphitrichous Flagella such that they form a Flagellar Bundle that likewise rotates Clockwise will be extended so long as the Bacterium is moving toward the Chemical or Stimulus. B. The Duration of the Counterclockwise Rotation of the Lophotrichous Flagella such that the Flagella Flagellar Bundle comes apart will be extended so long as the Bacterium is moving toward the Chemical or Stimulus. C. The Duration of the Clockwise Rotation of the Monotrichous Flagella such that the Flagella Flagellar Bundle comes apart will be extended so long as the Bacterium is moving toward the Chemical or Stimulus. D. The Duration of the Counterclockwise Rotation of the Peritrichous Flagella such that they form a Flagellar Bundle that likewise rotates Counterclockwise will be extended so long as the Bacterium is moving toward the Chemical or Stimulus. 36. Endospores (Spores) are Characteristic of Bacillus sp. and Clostridium sp. Spores are also produced by -- STOP! Please check your ScanTron for Boneheaded Errors. You have just answered Question 36. Proceed to Question 37.
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MIC 101 Exam 1 Page 22 37. How can Cyanobacteria, which have an Oxygen-releasing Photosystem II (P680), protect Nitrogenase from being denatured? A. All Photosynthetic Cyanobacteria sequester Nitrogenase in Heterocysts. _________________________________________________________________________ B. • Some Cyanobacteria sequester Nitrogenase in Heterocysts. • Some Cyanobacteria (mostly Soil-Dwellers like Heliobacter and Sporosarcina ) sequester Nitrogenase in Gas Vacuoles. _________________________________________________________________________ C. • Some Cyanobacteria sequester Nitrogenase in Heterocysts. • Some Cyanobacteria (mostly Soil-Dwellers like Heliobacter and Sporosarcina ) sequester Nitrogenase in Gas Vesicles. _________________________________________________________________________ D. • Some Cyanobacteria sequester Nitrogenase in Heterocysts. • Some Cyanobacteria employ a “Time Share” Scheme whereby Nitrogen Fixation and Photosynthesis occur in the same Cell at different Times. 38. Bacillus anthracis contains two separate Plasmids. One of these Plasmids (pX01) contains a Pathogenicity Island encoding Anthrax Toxins, Anthrax Toxin Regulatory Genes and Spore Germination Genes. The other Plasmid (pX02) encodes the Genes for the Capsule. Different Strains can be identified by the characteristic Sequences of their pX01 and pX02 and this allows these different Strains of Bacillus anthracis to be traced to their Lab of Origin.
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