key_exam2a_f08

key_exam2a_f08 - Name _ ID _ BIOLOGY 2A UCD FALL 2008 EXAM...

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Name ____________________________________ ID __________________________ B IOLOGY 2 A E XAM 2 A UCD F ALL 2008 G ERHART S TUDENT N AME ___________KEY___________________________________________ ID _____________________________________________________________________ Instructions (3 points): Fill in your name and student ID number on the scantron and the first and last pages of your exam booklet . Be certain that the bubbles of the scantron are filled in with your ID number and the correct version of your exam (found at the end of the Multiple Choice questions). Mark your scantron! Mark the last page (multiformat page) in PEN (answers recorded in pencil will be accepted, but can not be submitted for re-grading). Tear off the last page and turn it in separately from the scantron. B EST OF L UCK ON THE E XAM ! Scoring: Multiple choice (30 questions @ 2.5 points each) = 75 points + Multi-format page (22 points) + following directions (3 pts) __________________________________________________ = 100 points possible
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Name ____________________________________ ID __________________________ Choose the one best answer to each question, unless specifically told to choose two answers. 1. Adaptation is a consequence of natural selection. In this context, adaptation means A. an adjustment to environmental conditions B. acclimation C. both A and B D. a heritable trait that increases fitness E. any change in gene frequency 2. It is possible that every gene present in the world today arose initially by duplication of an earlier gene. Divergence of the copies then resulted in changes in both the sequence of DNA and the function of the resulting protein. Which of the following is the most reasonable guess for the function that was encoded by the first ‘primordial’ gene? A. Cytochrome c – a protein involved in oxidative respiration B. Chlorophyll – a protein involved in activation of electrons by light (in photosynthesis) C. An enzyme that contributes to RNA replication D. A regulatory protein such as repressor of transcription E. A protein involved in defending DNA against free radicals of oxygen 3. Choose the sequence of three bases (listed in order of insertion) that will first be incorporated into DNA when the given sequence is replicated from left to right as shown in the figure at right. A. G, C, C B. C, C, G C. G, G, C D. G, C, T E. C, G, G 4. A gene is A. any base sequence B. the instructions for a particular RNA or polypeptide C. a particular location on a chromosome D. any series of sense codons E. Both C and D 5. A nonfunctional protein typically results from all of the following EXCEPT A. loading of the incorrect amino acid onto a tRNA B. the addition of an extra nucleotide to the DNA C. a base substitution resulting in missense D. a base substitution resulting in nonsense E. a base substitution at the third letter of a codon
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Name ____________________________________ ID __________________________ 6. Initiation of trancription is directed by A. a base sequence of DNA called the promoter
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key_exam2a_f08 - Name _ ID _ BIOLOGY 2A UCD FALL 2008 EXAM...

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