Question 121 Which of the following would be an example of a synergistic effect?
ID: 995803 • Letter: Q
Question
Question 121
Which of the following would be an example of a synergistic effect?
A.Antidepressants and cold medicine together can lead to seizures.
B.Aspirin reduces fever and thins the blood.
C.Penicillin kills infectious bacteria and beneficial bacteria in the intestine.
D.Caffeine suppresses the appetite and causes the jitters.
E.None of these
Question 135
Why are seasonal fluctuations in atmospheric CO2 much more pronounced in the northern hemisphere compared to the southern hemisphere?
A.The trees and other photosynthetic plants absorb atmospheric carbon dioxide in summer in the northern hemisphere but lose their leaves in fall and winter, and photosynthesis stops.
B.During the fall and winter in the northern hemisphere decay of the organic matter generates carbon dioxide, which increases the atmospheric CO2 levels by the spring.
C.Both The trees and other photosynthetic plants absorb atmospheric carbon dioxide in summer in the northern hemisphere but lose their leaves in fall and winter, and photosynthesis stops and During the fall and winter in the northern hemisphere decay of the organic matter generates carbon dioxide, which increases the atmospheric CO2 levels by the spring are true.
D.CO2 production is more limited in the area of our planet's largest land masses, which are located in the southern hemisphere.
Question 136
How is most of the water consumed by individuals in the United States actually used?
A.We rinse it down the sink, tub, or toilet.
B.We drink it.
C.We use it to water our lawns.
D.It evaporates.
E.None of these
Question 137
Why do nutrient ions like nitrate and phosphate often lead to a decrease in aquatic life?
A.Algae grow rapidly and use up all the oxygen.
B.Aerobic bacteria grow rapidly and use up all the oxygen.
C.Anaerobic bacteria grow rapidly and use up all the oxygen.
D.All of these
E.None of these
Question 138
How are the disinfecting properties of ultraviolet light and ozone similar to each other?
A.Both provide residual protection against pathogens.
B.Both are relatively effective at destroying bacteria but not viruses.
C.Neither provides residual protection against pathogens.
D.Both are relatively effective at destroying viruses but not bacteria.
Explanation / Answer
We are only allowed to answer to 1 question per Q&A.
The correct answer for question 138 is letter B, since bacteria can be destroyed by different techniques. Ultraviolet light induces the production of free radicals and oxidative process which kill bacteria caused by the destruction of nucleic acids and DNA. Ozone acts in a very similar way as UV - light, ozone induces oxidative process in bacteria in which the membrane (cell wall) of the bacteria is damaged or destroyed.
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