Based on what we know today, what is the best explanation for why the emu, ostrich, and rhea are so similar despite
being geographically separated? What will be an ideal response?
ANSWER: The emu of Australia, the ostrich of Africa and the rhea of South America were at one time
all on the same land mass, and thus had a common ancestor. It was continental drift that was
responsible for separating them.
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Microorganisms were inoculated on two agar plates and incubated for 24 hours. After incubation, no microbial colonies were seen on the spread plate agar, but three microbial colonies were seen in the pour plate agar. What may account for this observation and how can growth of this microorganism be enhanced?
What will be an ideal response?
The major lymph vessel that collects excess
fluid from most of the body is the a. thoracic duct. b. hepatic portal vessel. c. subclavian vessel. d. right lymphatic duct. e. lymphocyte duct
During the 1980s, wolves were reintroduced to Yellowstone National Park after decades of absence due to attempted extermination in the early part of the twentieth century
Within 20 years, not only had the wolf population increased, but there was also a dramatic increase in other species, such as aspen, cottonwood, and willow trees, beavers, warblers, insects, and fish. These changes in Yellowstone Park are examples of how important a(n) ________ can be to an ecosystem. A) keystone species B) competitor C) herbivore D) parasite
Because of the formation of Barr bodies, normal human males have ___________ amount of gene products produced by the X-chromosome compared to females.
a) 2 times the b) the same c) 1/2 the d) 1/4 the