Many host races of the apple maggot have been identified; this is an example of allopatric speciation
a. True
b. False
ANSWER: False
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During prophase ____ are formed.
A. nucleoli B. new chromosomes C. spindles D. centromeres
A team of researchers is studying the external structures on the dorsal (back) surface of a spider mite. The spider mite seems to be the habitat of an even smaller mite, which is approximately 0.05 mm. While they can see the dorsal surface of the spider mite with their naked eye, they cannot see the mite clearly. The researchers are writing a grant to provide support for a microscope to use to study these new mites. They need to purchase a microscope with a high magnification to observe the new mites on their habitat. It is not necessary for them to observe living mites. Based on the information given, what type of microscope would you suggest?
A. dissecting microscope B. scanning electron microscope C. binocular compound light microscope D. transmission electron microscope
The proper positioning of bacterial chromosomes at the one-quarter and three-quarter positions prior to septum formation apparently is related to
a. chromosome condensation. b. a chemical gradient from the midpoint to the pole of the cell. c. recombination. d. a network of fibers that attach to the chromosomes and shorten, pulling them apart. e. growth of the bacterial cell wall at the midpoint.
The gram-negative bacillus associated with abscesses from dog and cat bites or scratches is
A. Salmonella typhimurium. B. Yersinia enterocolitica. C. Pasteurella multocida. D. Brucella suis. E. Francisella tularensis.