The text discusses at least two chemotheraputic drugs used for treating cancer. Can you describe how these drugs were originally obtained? Use your answer to provide one rationale for preserving the diversity of species on the planet
What will be an ideal response?
The text discusses taxol that comes from the bark of the Pacific yew tree, and vinblastine that comes from the periwinkle plant. These are only two of thousands of drugs that were originally extracted from some plant species. Imagine the drugs that might have been extracted from species of plants (or fungi, animals, etc.) that have already become extinct. Biodiversity is a treasure chest of potential resources. We should strive to preserve diversity for that reason as well as many other reasons.
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The special kind of fault along where different ocean plates are moving laterally away from each other is called:
a. trench. b. midocean. c. transform. d. arc. e. convergent.
The last portion of the excretory system through which urine passes before it is eliminated from the body is the
a. glomerulus. b. ureter. c. urethra. d. bladder. e. rectum.
The ratio of toxic dose to therapeutic dose is called the ________.
A. therapeutic index B. susceptibility quotient C. toxicity index D. phenol coefficient
Before Muller's discovery that radiation induces mutation, scientists had to work on mutations that were found solely by phenotype differences in natural populations
Which of the features of Drosophila made it a fortuitous choice for Morgan and his colleagues? A) having a long life cycle B) especially high rate of mutation C) large number of easily visible phenotypes D) well-known biochemical pathways E) the number of genes with only two alleles