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1st lecture exam spring 2009 mwf 1 1407 answers

1st lecture exam spring 2009 mwf 1 1407 answers -...

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Introductory Biology, Biology 1407. TAMU-CC. 1 st lecture exam 13 February 2008. MWF 1:00. 1-12 = 4 points each. 1. I often hear people say something like “Science only deals with proven facts. Evolution is not a proven fact. Evolution is only a theory.” This line of reasoning is very common among the general public. However, this line of reasoning indicates a misunderstanding of the nature and logic of science. Science depends on “if, then” deductive syllogisms. Hypotheses of this type of syllogism cannot be proved to be true because: a. a true prediction can be derived from a false hypothesis this is why science cannot prove anything to be true. Please see the truth table presented in lecture. b. a true prediction can be derived from a true hypothesis c. a false prediction can be derived from a false hypothesis d. a false prediction can be derived from a true hypothesis e. none of these choices 2. Which of the following could be subject to natural selection? a. little finger shape in humans (bends in toward the 4 th finger or is straight) b. There is genetically based variation for cold tolerance in a population of local sunflowers. Plants that can survive through the winter produce 35% more seeds that do the plants that die in December. A population with genetically based variation that impacts fitness. This is by far the best choice among these choices. c. In Hydrangea , flower color is determined by the acidity of the soil. On acidic soils, flowers are blue. On basic soils, flowers are red. More pollinators come to blue flowers than to red flowers. Is the trait genetically determined? I don’t think so either. d. In Chenopodium , there are several genes involved in making Rubisco. All the plants in the population have the same alleles at these genes to make Rubisco. Do you see any variation in this trait in the population? e. natural selection would not occur in any of these cases 3. If you show a hypothesis to be false, is there any possible way for the hypothesis to be true? NO!!!! If our series consists of even positive integers, then the next number is 8. 2, 4, 6, 7, ooops. There is NO way that this hypothesis could be true. If you show a hypothesis to be true, is there any possible way for the hypothesis to be false? YES!!!1 2, 4, 6, 8 OK, the hypothesis is true. However, we don’t know every number. Maybe later you have 2, 4, 6, 8, 10, 12, 14, 16, 17 a. yes; yes b. yes; no c. no; no d. no, yes
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