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- 3. A white powder thought to be morphine (C₁,H₁NO,) was found next to an unconscious person. Analysis of the powder produced the following result: 71.56% C, 6.71% H, 4.91% N. Show whether this analysis is consistent with morphine and what conclusion can be drawn from this piece of evidence. (M./gmol C-12.011; H 1.0079; 015.999; N=14.007]a) bacteria are “obligate anaerobes.” What does this mean? On Earth, where might these organisms live? (Give examples.) b) Humans (and most Eukaryotic organisms) are obligate aerobes. What does this mean? On Earth, where might these organisms live? (Give examples.)32. Paracoccus denitrificans is a Gram-negative denitrifying bacterium capable of aerobic and anaerobic processes. When oxygen is depleted, nitrate is reduced into nitrous oxide (N2O) and eventually to divalent nitrogen (gas). Which of the following statements is TRUE given the figure below? NO₂+2H NO+H₂O NO+2H N+H₂O NO₂ N₂O Periplasm RED RED 4H 2H"2H" 2NO+2H NO+H₂O Cyt DH NOR bc₁ NAD NO; +H₂O Cytoplasm Figure 1. Respiratory elements of P. denitrificans The figure is redrawn from similar schemes by Ferguson and Zumft. Abbreviations: AP, antiporter; NAR, nitrate reductase b; UQ, ubiquinone; DH, NADH dehydrogenase; Cyt bcl, cytochrome bcl complex; NOR, NO reductase; NO2- RED, nitrite reductase; N2O RED, N2O reductase; Cyt c550, cytochrome c550. Ⓒ Strohm et al., 2007 a. Oxidation of nitrate subsequently reduces water. O b. Nitrite (NO-2) is further reduced to N2 in the cytoplasm. O c. The electron transport chain in the figure is found in the mitochondrial matrix. O d. The electron…
- 4 5. 15. Ingredients are listed in order by: 16. Functions of food additives include: 17. Foods that claim to be "fresh": 18. The Percent Daily Values on food labels are based on a diet of: 19. Insulin is: 20. A diet high in sodium might increase: 21. A substance that protects against cell damage and is associated with lower risks of some types of cancer is: 22. The ideal range for temperature of a refrigerator should be: 23. Eggs are most likely to be contaminated by: Salmonella bacteria. 24. A food-borne illness most likely to be found in undercooked meat, especially hamburger, is : Escherichia coli.16. Photosynthetic organisms use energy from the sun to reduce A) formaldehyde; ethanol B) CO2; ethanol C) CO2;; carbohydrates D) CO2; oxygen E) none of the above toMy freezer broke,so I had to empty $500 of ruined food from the 390 liter freezer Now that my freezer is empty, room temperature,and waiting for the haul-away,if I were to fill it with 100% nitrogen gas instead of food, how many moles of nitrogen would fill a 390 liter freezer at STP?
- What is the Carbon content of Cast Irons? O a) Less than 2% O b) More than 2% Od Less than 14% O d) More than 14%i and ii10. Escherichia coli is a bacteria that can cause food poisoning if people eat contaminated food or drink. In the laboratory, Escherichia coli can triple every hour. If the bacteria count in a sample contaminated water is found to be 50 after the first hour, how long will it be until the count exceeds 100 000? Express your answer in hours. Use the explicit formula for your solution. Express your answer to two decimal places. Use methods learnt in class.
- 48)Researchers are designing several experiments to test the ability of Salmonella bacteria to develop antibiotic resistance. A culture of Salmonella bacteria is exposed to the same concentrations (200 mg/L) of an antibiotic for four days. The table shows the number of isolated resistant bacteria over a four-day period. Which of the following statements best explains these results? Day Number of Resistant Bacteria in the Culture 1 5 59 3 677 4 32,456 The bacteria were not affected by the antibiotic. After being exposed to the antibiotic, the bacteria altered their DNA. A new species of bacteria emerged after the antibiotics were introduced. Random mutations led some bacteria to be resistant and, over time, they increased in the population.19. The similarity of one organism to another (for example a bacteria versus a human) is most easily done by comparing which biopolymer? A) nucleic acids B) polysaccharides C) proteins D) lipids E) all of the aboveIn a series of infection experiments, a researcher discovers that the ID50 value for the infectious bacterium Parasiticum mucoides is 2,000, and that the ID50 for another infectious bacterium, Donoteatum thisbacterium, is 150. Given these data, a person exposed to 1,000 bacteria of each type would be more likely to be infected by which bacterium? O Parasiticum mucoides O Both infections are equally likely Donoteatum thisbacterium There is no way to know given the information provided MacBook Air DD F9 80 000 000 F8 F7 F6 F5 F4 F3 *