2 SEM ACC W/RAVEN CARDED
2 SEM ACC W/RAVEN CARDED
12th Edition
ISBN: 9781264439218
Author: Raven
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 27, Problem 2U

A bacteria that obtains carbon from the atmosphere and energy and electrons from reduced inorganic compounds is best characterized as a

  1. a. chemoorganoheterotroph.
  2. b. chemoheterotroph.
  3. c. chemolithoautotroph.
  4. d. photolithoautotroph.
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Is oxygen a requirement for the growth of all organisms? Describe the following in terms of oxygen need.
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A. Antibiotics, such as gentamicin, are used in media to prevent growth of susceptible microbes. Is gentamicin media a selective, differential or enrichment media? B. Sorbitol is a sugar alcohol that all Escherichia bacteria can normally ferment into an acidic waste compound. This acidic end product is detected by including a pH indicator in the agar and noticing a color change. The strain of Escherichia that is a common food pathogen, E. coli O157:H7, however can not ferment sorbitol. It will grow similar to other E. coli, but not change the agar color. Is sorbitol in nutrient agar a selective, differential or enrichment media?​
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