What is the function of the structure labeled as B in the accompanying figure?
a. To provide locomotion
b. To prevent phagocytosis
c. To carry genetic information
d. To transmit DNA between bacteria
e. To adhere to surfaces or other bacteria
e
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Halobacterium salinarum and certain other extreme halophiles carry out light-driven synthesis of ATP under what condition?
A) low oxygen concentrations B) low light C) high oxygen concentrations D) high carbon dioxide concentrations
Some anoxygenic photosynthetic bacteria use ________ as their electron source.
A. sulfur B. hydrogen C. hydrogen sulfide D. All of these choices are correct.
You expect that a mutation in E. coli that was recently isolated results in loss of enzyme R activity. In looking for the gene, you find comparable sequences. Using an in vitro transcription translation system, you use the gene obtained from the mutant, as well as a wild type E. coli as a control. Following protein isolation and gel electrophoresis, you observe that the wild type E. coli produces
a protein that is 35K in size, corresponding to enzyme R. However, the mutant strain produces a protein that is 25K in size. What does this information suggest? A) A nonsense mutation has occurred, resulting in a truncated, nonfunctional product in the mutant. B) A large addition has occurred in the wild type strain, such that approximately 35 tandem repeats of this gene are present and are biologically active. C) A missense mutation has occurred, resulting in a truncated, nonfunctional product in the mutant. D) all of the above E) Not enough information is given.
What do you predict would happen if flower growth became indeterminate?
A. The flowers would lose their distinct shape. B. The flower size would be reduced. C. The flowers would be enormous. D. Pollen and seed production would cease.