The separate feeding locations of these five warbler species on different portions of the same tree illustrates:
A. biotic transformation.
B. competitive exclusion.
C. resource partitioning.
D. top-down population regulation.
Ans: C. resource partitioning.
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A bacteria contains two copies of the lac operon; one on the bacterial chromosome and one on a plasmid. The lacO site on the chromosomal lac operon is mutated and non-functional whereas the lacO site on the plasmid is functional. What is the most likely outcome for the bacterial cell when glucose is declining and lactose is present?
A. Expression of lac structural genes on the chromosome and plasmid will decrease because two copies of the lacO site are needed for repression of the lac operon. B. Expression of lac structural genes on the chromosome and the plasmid will increase because more repression of the lac operon occurs as glucose decreases. C. Expression of lac structural genes on the chromosome and plasmid will increase because the lacO site does not affect the CAP protein that activates the operon. D. Expression of lac structural genes will not change because the lacO site is not involved in repression of the lac operon.
After the bacteria were left in the dark for two minutes, the bacteria were
a. evenly distributed throughout the chamber. b. clustered on the algal filament. c. clumped along certain areas of the algal filament. d. actively avoiding the algal filament.
Most mammals have uricase, which converts uric acid into
A. ammonia. B. allantoin. C. urea. D. water.
All of the following are characteristics that make plasmids good cloning vectors, except
A. they are well characterized. B. they can accept a relatively large amount of foreign DNA. C. they are small. D. they can be transferred into appropriate host cells. E. they can carry genetic markers, such as antibiotic resistance genes.