Which of the following is NOT a possible use of reproductive cloning?
A) the production of genetically identical mice and rats for experimentation
B) the production of organs in large farm animals for transplant into humans
C) restocking populations of extinct animals such as the wooly mammoth
D) creating stocks of stem cells for human therapeutic use
D
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. If the efficiency of the alveoli in an human was reduced by 50%, what would you predict would be the effect?
A. The volume of air in the lungs would decrease by 50%. B. The rate of gas exchange would decrease by 50%. C. The affinity of hemoglobin for oxygen would decrease by 50%. D. The muscular control of breathing would decrease by 50%.
The nitrogenous base found in RNA but not in DNA is
a. adenine. b. cytosine. c. guanine. d. uracil. e. thymine.
The mode of natural selection in which two or more extreme phenotypes are fitter than the intermediate phenotype is
A. directional selection. B. stabilizing selection. C. disruptive selection. D. artificial selection. E. uniformitarianism.
The evolution of bilateral symmetry enabled animals to
A. evolve cephalization. B. evolve feeding organs. C. become motile. D. reproduce sexually.