Microbial Nutrition and Growth exam with complete solutions

1) A microorganism grows in the lab on medium containing mineral salts but no organic compounds. The organism is likely to be a(n) A) heterotroph. B) autotroph. C) chemotroph. D) chemoheterotroph. E) The answer cannot be determined from the information provided. Answer: B Bloom's Taxonomy: Comprehension Section: Growth Requirements Learning Outcome: 6.1 2) A cell that uses an organic carbon source and obtains energy from light would be called a A) photoheterotroph. B) lithoautotroph. C) photoautotroph. D) chemoheterotroph. E) chemoautotroph. Answer: A Bloom's Taxonomy: Comprehension Section: Growth Requirements Learning Outcome: 6.2 3) A(n) ________ organism require(s) oxygen for growth. A) anaerobic B) facultative anaerobic C) aerotolerant D) obligate aerobic E) aerotolerant and an anaerobic Answer: D Bloom's Taxonomy: Knowledge Section: Growth Requirements Learning Outcome: 6.3 4) An aquatic microbe that can grow only near the surface of the water is probably which of the following? A) a phototroph B) a heterotroph C) a chemotroph D) a lithotroph E) an anaerobe Answer: A Bloom's Taxonomy: Analysis Section: Growth Requirements Learning Outcome: 6.2 5) The carotenoid pigments of some phototrophs interact with ________ to reduce its toxicity. A) singlet oxygen (1O2) B) hydroxyl radical (HO-)