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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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A scientist isolates a new species of prokaryote. They note that the specimen is a bacillus with a lipid bilayer and cell wall that stains positive for peptidoglycan. Its circular chromosome replicates from a single origin of replication. Is the specimen most likely an Archaea, a Gram-positive bacterium, or a Gram-negative bacterium? How do you know?
A disease that is constantly present in a population is called _____.
a. pandemic
b. epidemic
c. endemic
d. re-emerging
Which of the following statements about the nitrogen cycle is false?
a. Nitrogen fixing bacteria exist on the root nodules of legumes and in the soil. b. Denitrifying bacteria convert nitrates (NO3 - ) into nitrogen gas (N2 ).
c. Ammonification is the process by which ammonium ion (NH4 + ) is released from decomposing organic compounds.
d. Nitrification is the process by which nitrites (NO2 - ) are converted to ammonium ion (NH4 + ).
The first organisms that oxygenated the atmosphere were
a. cyanobacteria
b. phototrophic organisms
c. anaerobic organisms
d. all of the above
Explain the reason why the imprudent and excessive use of antibiotics has resulted in a major global problem.
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