Protein A has a strong affinity for
A) antigen.
B) blood.
C) protein.
D) antibody.
Answer: D
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In 1909, Charles Walcott discovered fossils in the Burgess Shale of the Canadian Rockies. The area was formed by an underwater mudslide that provided an oxygen free environment, so decomposition was minimal. Why were these fossils so unique?
A. They were from the Cambrian period. B. There were both vertebrate and invertebrate (soft bodied) animals fossilized. C. Only invertebrate (soft bodied) animals were found and no vertebrate animals or plants. D. Before this discovery, it was thought that mudslides could not occur underwater. E. The first bird fossil, Archaeopteryx, was discovered in this area.
What are the benefits, real and potential, of
adult cell cloning?
a. the timing of the production of offspring can be controlled b. cloned animals will be consistently the same as their donor c. cloned cells can be used to study the processes of cell differentiation d. cloned cells can be used to study the process of diseases and thus potentially lead to cures e. all of these are benefits of adult cell cloning
Signals from the parasympathetic nervous system
cause which of the following? a. increase in blood pressure b. increase in pulse rate c. increase in digestive activities d. increase in blood sugar level e. increase in metabolic rate
Which of the following is not a virulence factor of Shigella species?
A) the manufacture of several toxins that damage intestinal cells and induce fluid efflux B) the capability to cause stomach ulcers C) the ability to escape from phagocytes D) the capacity to pass between infected cells using an actin propulsion system E) a system that induces host cells to endocytose the bacteria