When a land bridge connecting two continents
is cut off due to rising sea levels, this can lead
to
a. sympatric speciation.
b. disruptive selection.
c. directional selection.
d. hybrid sterility.
e. allopatric speciation
E
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An animal's metabolic rate is defined by its overall rate of (select all correct choices):
A. energy use. B. glycolysis. C. anaerobic respiration. D. aerobic respiration. E. activity.
Which of the following best describes the route of water into the water vascular system of a starfish?
A. Water enters through the madreporite into the ring canal and from thence into the radial canals to the ampullae and finally into the tube feet. B. Water enters the madreporite into the radial canals and from thence into the ring canal, then the ampullae and finally into the tube feet. C. Water enters the madreporite into the ampullae and from thence into the ring canal, then the radial canals to the ampullae and finally into the tube feet. D. Water enters the ampullae and then goes to the tube feet and from thence to the radial canals, then the ring canal, and finally exits through the madreporite. E. Water enters the ring canal, then goes into the radial canals, and finally through the madreporite to the ampullae and tube feet.
The complement system functions to ____ and ____
a. mobilize B cells; initiate antibody production b. help the innate immune system; turn on expression of T-cell receptor protein genes c. destroy invading cells; provide a physical barrier against pathogens d. destroy invading cells; guide phagocytes to the infection site e. destroy viruses; guide phagocytes to the site of inflammation
The microtubule organizing center (MTOC) of an animal cell is an identifiable structure known as the ____
a. cell plate b. centrosome c. kinetochore d. centromere e. chromosome