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Chapter 22: Q. 10 (page 570)
Which of the following consist of prokaryotic cells?
a. bacteria and fungi
b. archaea and fungi
c. protists and animals
d. bacteria and archaea
The prokaryotic cells are the bacteria and archaea.
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Which of the following statements is true?
a. Gram-positive bacteria have a single cell wall anchored to the cell membrane by lipoteichoic acid.
b. Porins allow entry of substances into both Gram positive and Gram-negative bacteria.
c. The cell wall of Gram-negative bacteria is thick, and the cell wall of Gram-positive bacteria is thin.
d. Gram-negative bacteria have a cell wall made of peptidoglycan, whereas Gram-positive bacteria have a cell wall made of lipoteichoic acid.
Halophiles are organisms that require________.
a. a salt concentration of at least 0.2 M
b. high sugar concentration
c. the addition of halogens
d. all of the above
Imagine a region of soil became contaminated, killing bacteria that decompose dead plants and animals. How would this effect the carbon cycle in the area? Be specific in stating where carbon would accumulate in the cycle.
The first organisms that oxygenated the atmosphere were
a. cyanobacteria
b. phototrophic organisms
c. anaerobic organisms
d. all of the above
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
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