Which of these is an ecosystem?
A. lakes
B. all of the fish in Lake Erie
C. Lake Erie and everything living in it
D. the producers found in Lake Erie
C. Lake Erie and everything living in it
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Which one of the following is characteristic of both living organisms and non-living material?
A. the capacity to evolve B. the ability to reproduce C. complexity, with spatial organization on several levels D. the ability to change in response to the environment E. obeying the basic laws of chemistry and physics
Which syndrome is not correctly matched to its aneuploid condition?
A. Down syndrome - trisomy 21 B. Edward syndrome - trisomy 18 C. Klinefelter syndrome - XO D. Jacobs syndrome - XYY
Tissue culture techniques are used to
a. produce hundreds of identical plants. b. propagate promising mutant plants. c. improve food crops. d. increase production of commercially important hybrid plants. e. do all of these.
Compared to the vital capacity, how much air can lungs actually hold?
A) always less B) sometimes less C) always more D) sometimes more