little explanation for each please (6-5; U) 1. Shown are three agar tubes, which
ID: 133638 • Letter: L
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little explanation for each please
(6-5; U) 1. Shown are three agar tubes, which have been inoculated with different bacteria and incubated for 48 hours. Which bacteria should grow in an aerobic environment (assuming all other metabolic requirements are satisfied)? a. The bacteria in Tube A b. The bacteria in Tube B c. The bacteria in Tube C d. The bacteria in Tubes A &B; e. The bacteria in Tubes B & C ??? (6-5; K) 2, which term best describes the organism growing in Tube B in Question #57 d. strict (obligate) anaerobe e. strict (obligate) aerobe a. psychrophile b. halophile c. facultative anaerobe (6-5; K) 3. Assume you inoculated 100 facultatively anaerobic cells onto nutrient agar and incubated the plate aerobically. You then inoculated 100 cells of the same species onto nutrient agar and incubated the second plate anaerobically. After incubation for 24 hours, you should have a. b. c. More colonies on the aerobic plate More colonies on the anaerobic plate. The same number of colonies on both plates. (6-5; K) 4. Which temperature would most likely kill a mesophile (not just slow growth)? ?, -50? b. 0C c. 9C d. 37C e. 60C (6-7; A) 5. Nitrogen is required for cells to grow because it is needed for making a. b. c. d. e. lipids. amino acids. nucleic acids. lipids and amino acids. amino acids and nucleic acids.Explanation / Answer
1) The bacterial growth is found near the surface of agar in test tubes A and B. In test tube C, the bacterial growth is found at the bottom. So, bacteria in tube A and B grow in an aerobic environment. So, the answer for this question is option d.
2) The organism in tube B grows both at the surface and at the bottom. So, it is best described as facultative anaerobe (option c).
3) Facultative anaerobes have the capacity to survive in both the aerobic and anaerobic environment. So, when 100 cells of anaerobes are inoculated in both aerobic and anaerobic environment, the same number of colonies grow on both plates (option c).
4) Mesophile grow best between 20 to 45 degrees celsius. So, when temperature of -50C is reached, most of the mesophiles will be killed.
5) Nitrogen is an essential component for both amino acids and nucleic acids (option e).
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