BIS2nd_midtermGERHART

BIS2nd_midtermGERHART - BIOLOGY 2A UCD SPRING 2008 EXAM 2B...

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B IOLOGY 2 A E XAM 2 B UCD S PRING 2008 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 in pencil not eligible 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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2 Choose the best answer to each of the following questions. If two answers are asked for, mark BOTH correct responses to get credit. Choose two answers ONLY when specifically asked to do so. 1. The binding of the ribosome during translation is controlled by __________ which is made of _______ A. A base sequence 5’ to an AUG; RNA B. The start codon; DNA C. An RNA polymerase ; protein D. A Promoter; DNA E. A 5’ Cap; RNA Use the figure to the right to answer the following 4 questions. 2. *Which bond attaches a new nucleotide to the chain (phosphodiester bond)? (chose A, B , C, D or E) 3. Which is the 3’ end? (chose A, B, C, D or E) 4. Where would the next nucleotide be attached? (chose A, B, C, D or E) 5. Is this molecule DNA or RNA? A. DNA because uracil is not present B. RNA because there is a hydroxyl at carbon 2 C. RNA because the molecule is single-stranded D. DNA because the molecule lacks a hydroxyl at carbon 2 E. RNA because thymine is not present 6. Most genetic control mechanisms are based on an “allosteric” molecule that both senses the problem and acts in response to the information. Which statement best describes these molecules. A. A protein that is encoded by two different genes, each producing a different version of the protein. B. A single molecule (protein, RNA or DNA sequence) that can assume two different configurations, each with a distinct functionality. C. A single molecule with a three-dimensional structure whose surface features contribute to some cellular function. D. An allosteric protein has a structure “other than” that of the wild type protein. E. The two forms of an allosteric molecule are found in different organisms in a polymorphic population.
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3 7. Redundancy was said to be the key feature of the hereditary material (DNA). Which TWO of the following statements describe benefits provided by redundancy.
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BIS2nd_midtermGERHART - BIOLOGY 2A UCD SPRING 2008 EXAM 2B...

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