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1 ST E XAM , BIOL 164, G ENETICS , E VOLUTION S OCIETY , S PRING 2007 NAME (Last/Family Name First): ________________________________ Signature: ________________________________ Student ID Number: ________________________________ Instructions : Circle the correct answer, or circle the letter corresponding to the correct answer, or write in the correct answer, as appropriate. In all cases, write legibly; answers that I cannot read will be considered incorrect. All questions are of equal point value. Good luck! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 1. Which element of the four-part Darwinian syllogism of natural selection would be violated by a species in which each individual could only mate once in their life, and every mating only produced two offspring? Excess population growth. ________________________________ 2. In the ecological equation, dN/dt = rN[(K-N)/K], what does dN/dt stand for? a. The number of individuals in the population. b. The total number of individuals that the local habitat can support. c. The number of individuals added to the population in a particular time unit, such as a generation. d. None of the above. 3. The observation that all of life uses L-amino acids provides evidence: a. That there is a mechanism of natural selection b. That all of life descended from a single common ancestor c. That left-handed people are more in tune with the universe 4. When a cell divides in two, it replicates its DNA and each daughter cell gets a DNA molecule (one on the left, and one on the right, below). The bold letters indicate one of the strands of the parental cell’s original DNA molecule. Below, label which strands were part of the original parental DNA molecule (as “parent”), and which strands are newly synthesized DNA (as “daughter”). ____parent______ GATTACA GATTACA _____daughter______ | | | | | | | | | | | | | | _____daughter______ CTAATGT CTAATGT _____parent_______
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5. The most common kind of mutations in DNA are transitions, which appear to arise from tautomeric shifts. These mutations cause substitutions of purines for purines or pyrimidines for pyrimidines. Circle all the transitions below: G A A T G T A C G C T C 6. How many hydrogen bonds does T make with its usual base-pairing partner? 2
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