Question

I need help answering the following microbiology questions.

1. The three tubes in the image to the right contain glucose and the pH indicator phenol red. The middle and left tubes were inoculated with bacteria, and the right tube was left uninoculated as a control. Which of the tubes show evidence of heterolactic fermentation? a. Left tube Gas b. Middle tube c. Right tube d. None of the three tubes Yellow Red Red 2. Which of the three tubes in the figure show ethanolic fermentation? a. Left tube b. Middle tube c. Right tube d. None of the three tubes 3. How will you determine if a bacteria ferments only LACTOSE using the same technique as above? a. add lactose in addition to glucose b. replace glucose with lactose c. replace pH indicator with neutral red d. incubate tubes at room temperature 4. Ultimately, respiration and fermentation are simply different ways to conclude sugar catabolism. Following the energy-yielding reactions, respiring cells pass electrons to oxygen (or other external inorganic oxidant), while fermenting cells dump clectrons back onto a partially oxidized organic molecule, which then exits the cell as a waste product. Either way, the goal of fermentation is to do which of the following? a. fully oxidize NADH into CO2 and H O b. oxidation of NADH to NAD+ c. reduction of NAD+ to NADH d. break down NADH into biosynthetic precursors 5. Glycolysis is utilized by cells undergoing respiration but not by fermenters. a. True b. False 6. Both respiration and fermentation require the use of an electron transport systerm a. True b. False

Answer 1

6)B. False

7)B.false

8)A. True

14)C. antiport

15)C. Psychrophiles grow at 25c

16)B. chemoheterotrophs

17)E. b and c

18)B. Probiotics

19)A. Biofilms develop on catheters

20)B. Propionibacterium

21)B. Listeria monocytogenes