Environmental air temperature can fluctuate many degrees during the course of a day. A human's body temperature
A. can also fluctuate many degrees.
B. must be maintained within a range of a few degrees.
C. is raised by sweating and dilation of blood vessels in the skin.
D. is not maintained internally but fluctuates with the air temperature.
E. is lowered by shivering.
Answer: B
You might also like to view...
Put the following steps in the procedure for producing a karyotype in the correct order.
I. Cells are visualized under the microscope. II. Cells are stimulated to divide. III. Homologues are organized into sets by matching size and banding patterns. IV. The cells are exposed to a hypotonic solution. V. Cells are stained and placed on a microscope slide. A. I, II, IV, V, III B. II, IV, V, I, III C. IV, II, V, I, III D. IV, V. II, I, III E. II, IV, I, V, III
states that two species cannot coexist indefinitely in the same niche.
A. Zonal exclusion theory B. Endosymbiotic theory C. Co-inclusion principle D. Competitive exclusion principle E. Second law of thermodynamics
This process uses an electrical current to move DNA through a gel matrix based on size.
A. gel electrophoresis B. PCR C. translocation D. gel transformation
What is a potential problem with the use of transgenic varieties of plants that contain Bt toxin?
A) Bt toxin may be harmful to humans. B) Bt toxin may be harmful to some beneficial insects. C) Transgenic crop varieties with Bt toxin are not very hardy and require a lot of care. D) Transgenic crop varieties with Bt toxin require large amounts of chemical insecticides to grow.