Mary died suddenly of an aortic aneurysm (the sudden bursting of one of the body's largest blood vessels). Which of the following conditions should her children worry most about?
A) hemophilia
B) Turner syndrome
C) Marfan syndrome
D) albinism
C
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Summarize the human social elements necessary to address when designing a conservation plan
What will be an ideal response?
Field observation suggests that populations of a particular species of herbivorous mammal undergo cyclic fluctuations in density at three- to five-year intervals. Which of the following represent (a) plausible explanation(s) of these cycles?
A) Periodic crowding affects the endocrine system, resulting in increased aggressiveness. B) Increases in population density lead to increased rates of predation. C) Increases in rates of herbivory lead to changes in the nutritive value of plants used as food. D) Increases in population density lead to more proximal infestations of parasites to host animals. E) All of the above are plausible explanations of population cycling.
Based on fossil evidence, eukaryotes evolved about ________ years ago
A) 500,000 B) 1 billion C) 1.8 billion D) 3.5 billion
What type of vaccine is the hepatitis B vaccine?
A. inactivated whole pathogen B. attenuated vaccine C. toxoid vaccine D. a recombinant vaccine composed of a single antigen of the hepatitis virus E. a vaccine produced by treating the virus with formaldehyde