A pro- strain of bacteria, which has not been in contact with any other strains, develops the ability to produce the amino acid proline. This mutant "rescue" could have been caused by
A. addition of the pro+ gene via transduction.
B. mutation of the pro- gene during phage integration.
C. removal of the pro- gene during excision.
D. addition of the pro+ gene via transformation.
E. correction of the pro- gene by reverse transcriptase.
A. addition of the pro+ gene via transduction.
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In Figure 47-1, dentin is labeled as number:
a. 1
b. 2
c. 3
d. 4
e. 5
Amphibians evolved directly from which ancestral organisms?
a. fishes b. reptiles c. small mammals d. soft-bodied animals e. marine invertebrates
Electrons generated from the Krebs cycle go next to the ________.
A. fermentation pathway B. electron transport chain C. formation of alcohol D. fluid portion of the mitochondrion
Which of the following is not a physical method of microbial control?
a. filtration b. radiation c. hot or cold temps d. antibiotics