The cell-mediated response targets intracellular
a. bacteria.
b. histamine.
c. TCRs.
d. MHC markers.
e. all of these.
Answer: a
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The scientist responsible for the development of the first anti-plague vaccine in 1866 was
A. Alexandre Yersin. B. Robert Koch. C. Louis Pasteur. D. Josef Marburg.
Much of our understanding of how large organisms respond to environmental variation is based on observations of
model species.
Indicate whether the statement is true or false.Why do organisms that share a common environment often also share common features?
a. Living in close proximity leads to inter-breeding of the species. b. They likely share common parasites as well, and the parasites are responsible for horizontal gene transfer between the species. c. Sharing a common environment means they face similar environmental pressures. d. Over time, species that cohabitate start to look alike.
Secretory IgA antibodies are unique because they
A. have unique light chains. B. are Y-shaped molecules. C. are present in the plasma. D. are connected with J chains and short polypeptides to form dimers. E. are present in lymph nodes.