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Chapter 22: Q.34 (page 572)
Explain the statement that both types, bacteria and archaea, have the same basic structures, but built from different chemical components.
Both Archaea and Bacteria possesssimilar basic compositions, however, they are built from distinct chemical constituents.
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Describe briefly how you would detect the presence of a non culturable prokaryote in an environmental sample.
Which of these statements is true?
An antibiotic is any substance produced by a
organism that is antagonistic to the growth of
prokaryotes.
An antibiotic is any substance produced by a
prokaryote that is antagonistic to the growth of
other viruses.
An antibiotic is any substance produced by a
prokaryote that is antagonistic to the growth of
eukaryotic cells.
An antibiotic is any substance produced by a
prokaryote that prevents growth of the same prokaryote.
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
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?
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 + ).
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