key_exam2b_f08 - B IOLOGY 2 A E XAM 2 UCD F ALL 2008 B G...

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Unformatted text preview: B IOLOGY 2 A E XAM 2 UCD F ALL 2008 B G ERHART S TUDENT N AME ______________ ___________________________________________ 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 Choose the one best answer to each question, unless specifically told to choose two answers. 1. Why does being double stranded make DNA less susceptible to mutation? A. If one strand has a thymine dimer (adjacent thymines that bond with each other), the other strand can be used as a template to fix the damage. B. If there is a base substitution during replication, it is detectable and can be repaired. C. The bases in single stranded DNA are more susceptible to chemical modifications than the bases are in double stranded DNA. D. A, B, C are all true E. Only two of the choices are correct 2. The most useful type of mutation, in terms of potentially providing raw material for new functions, is probably: A. a base change B. the deletion of an entire gene C. a single base deletion D. the duplication of a base E. the duplication of an entire gene 3. Initiation of trancription is directed by A. a base sequence of DNA called the promoter B. a base sequence of RNA called the ribosome binding site C. a start codon D. the A site of the ribosome E. Both B and C work together 4. The lac operon is subject to both positive and negative control. Negative control involves all BUT which TWO of the following (choose two answers): A. the binding of a protein to the DNA B. an increase in the transcription rate C. prevention of transcription D. binding of RNA polymerase to the DNA E. allosteric regulation of a regulatory protein 5. 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?...
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This note was uploaded on 02/03/2010 for the course BIS 2A taught by Professor Grossberg during the Spring '08 term at UC Davis.

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key_exam2b_f08 - B IOLOGY 2 A E XAM 2 UCD F ALL 2008 B G...

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