Most of the following homeostatic responses of animals are obligate. Select the exception
a. carbonic acid buffering system regulating pH of blood
b. basking in the sun
c. shivering when cold
d. kidneys regulating the osmotic content of blood
e. closing of capillaries near the skin in the cold
B
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By the end of the 21st century, it is expected that the human population will:a
increase at the fastest rate in the highly developed countries. b. increase at the fastest rate in the less developed countries.
c. increase at similar rates in all countries. d. decrease at similar rates in all countries. e. achieve zero population growth.
The number of DNA molecules in a duplicated chromosome is _________________.
A. one B. undetermined C. half that of an unduplicated chromosome D. two E. four
What is the function of the ascending loop of Henle?
a. It provides water for reabsorption by the interstitial fluid and capillaries. b. It loses urea to the renal medulla, helping this tissue to maintain its concentration gradient of solutes. c. It absorbs some drugs and poisons from surrounding capillaries. d. It helps maintain the concentration gradient of NaCl in the interstitial fluid, thus increasing water reabsorption. e. It collects processed filtrate from the nephrons.
Agglutination tests make use of the fact that
A) antibodies have two antigen-binding sites and will cause clumping when bound to antigen. B) the presence of antibodies in a patient's serum will prevent viral infection of cells in culture. C) a reporter enzyme can be bound to an antibody to provide a visual change with a positive test. D) antibodies bound to antigen will precipitate in a gel matrix. E) T cells will release interferon-gamma during certain infections.