The cell-mediated response involves all of the
following EXCEPT
a. dendritic cells with antigen-MHC
complexes.
b. production of helper T cells.
c. production of cytokines.
d. production of cytotoxic cells.
e. production of antibodies
E
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The North American maggot fly diverged into two species because some individuals fed on apples rather than hawthorn trees. Apple fruit mature more quickly than hawthorn fruit, therefore maggot flies that fed on apples also developed more quickly. Pea aphids can feed on alfalfa or red clover; some aphids have higher fitness when eating clover others when eating alfalfa. Host preference can
eventually lead to speciation because A. genetic differences develop. B. lower fitness may result from choosing the wrong host. C. temporal isolation may occur. D. anagenesis may occur. E. genetic differences develop, higher fitness and temporal isolation may occur.
Which of the following phyla are NOT lophotrochozoans?
A. Platyhelminthes B. Mollusca C. Annelida D. Rotifera E. Nematoda
Acts to protect Canadian geese were put into
effect in the a. 1700s. b. 1800s. c. early 1900s. d. late 1900s. e. 2000s
Which of the following statements concerning phospholipids is FALSE?
a. They have two distinct regions, one strongly hydrophobic and the other strongly hydrophilic. b. They are amphipathic molecules. c. They have cylindrical shapes that allow them to associate with water most easily as a bilayer structure. d. They contain a polar organic group attached to a phosphate group. e. They contain three fatty acids chains.