Chapter 22: Q. 6 (page 570)
The first organisms that oxygenated the atmosphere were
a. cyanobacteria
b. phototrophic organisms
c. anaerobic organisms
d. all of the above
The first organism that oxygenated the atmosphere was cyanobacteria.
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Farmers continually rotate the crops grown in different fields to maintain nutrients in the soil. How would planting soybeans in a field the year after the field was used to grow carrots help maintain nitrogen in the soil?
Ammonification is the process by which _____.
a. ammonia is released during the decomposition of nitrogen-containing organic compounds
b. ammonium is converted to nitrite and nitrate in soils
c. nitrate from soil is transformed to gaseous nitrogen compounds such as NO, N2O, and N2
d. gaseous nitrogen is fixed to yield ammonia
Explain the reason why the imprudent and excessive use of antibiotics has resulted in a major global problem.
In addition to providing yogurt with its unique flavor and texture, lactic acid-producing bacteria also provide which additional benefit during food production?
Select one:
a. Providing xenobiotics
b. Lowering the pH to kill pathogenic bacteria
c. Pasteurizing milk products
d. Breaking down lactose for lactose-intolerant individuals
Which of these occurs through symbiotic nitrogen fixation?
a. The plant benefits from using an endless source of nitrogen.
b. The soil benefits from being naturally fertilized.
c. Bacteria benefit from using photosynthates from
the plant.
d. All of the above occur.
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