Which bacterium contains a large Ti plasmid and causes crown gall disease in plants?
A) Agrobacterium rhizogenes
B) Agrobacterium tumefaciens
C) Aliivibrio fischeri
D) Butyrivibrio fibrisolvens
Answer: B
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Selection pressures acting on a population may favor
a. individuals at the left end of the range of variation. b. individuals at the right end of the range. c. extreme individuals at both ends of the range. d. the intermediate individuals within the range. e. all of these.
Which of the following functions would most likely be occurring in the structure surrounded by the
box in Figure 4-2?
a. apoptosis
b. dynein movement
c. formation of hydrogen peroxide
d. molecular chaperone activity
e. cholesterol synthesis
Both the founder effect and the bottleneck effect are mechanisms that produce large allele frequency sampling errors in a small population due to __________
A) random mutation B) gene flow C) gene drift D) lethal alleles E) random mating
The productivity of an ecosystem usually ________ through succession
Fill in the blank(s) with correct word