BIO 202 HW 6

BIO 202 HW 6 - BIOL 202 HOMEWORK #6 Student's Name_KEY_...

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BIOL 202 Student’s Name___________________ KEY ______ HOMEWORK #6 Section number and TA’s name:_________________ DUE: March 6/7 in your discussion section. IMPORTANT: Please type (not hand-write) your answers onto the question sheet itself (this sheet). Please highlight or otherwise indicate the parts that you have typed with underlining or bold ing. 1. The following events, steps, or reactions occur during E. coli replication. For each entry in Column I (A-M), select the appropriate entry in Column II (1-8). Each entry in Column I may have more than one answer, and each entry in Column II may be used more than once. Column I Column II A. Unwinds the double helix 3) helicase 1. Polymerase I D, E, G, I, J, L (0.5 pt) B. Prevents reassociation of complementary bases 6) SSB protein 2. Polymerase III D, F, G, J, L (0.5 pt) C. Is an RNA polymerase 4) primase 3. Helicase A (0.5 pt) D. Is a DNA polymerase 1) pol I 2) pol III 4. Primase C, G, L (0.5 pt) E. Replaces RNA primers 1) pol I 5. Ligase K (0.5 pt) F. Is the major elongation enzyme 2) pol III 6. SSB protein B (0.5 pt) G. Is a 5’ to 3’ polymerase 1) pol I 2) pol III 4) primase 7. Topoisomerase M (0.5 pt) H. Is a 3’ to 5’ polymerase 8) none of these 8. None of these H (0.5 pt) I. Has 5’ to 3’ exonuclease activity 1) pol I
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J. Has 3’ to 5’ exonuclease activity 1) pol I 2) pol III K. Bonds free 3’OH end of a polynucleotide to a 5’ end of another polynucleotide 5) ligase L. Bonds 3’OH end of a polynucleotide to an incoming free 5’ nucleotide triphosphate 1) pol I 2) pol III 4) primase M. Relieves tension in unwinding DNA 7) topoisomerase (4 pts) 2. In sweet peas (a diploid plant) the synthesis of purple anthocyanin pigment in the petals is controlled by two genes, B and D. The biosynthetic pathway is: Gene B enzyme Gene D enzyme White intermediate----------------> Blue intermediate --------------------> Anthocyanin a. What petal colour would you see in a plant that was homozygous for a mutation unable to catalyze the first reaction ? (0.5 pt) If it couldn’t make B enzyme, it would stay
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BIO 202 HW 6 - BIOL 202 HOMEWORK #6 Student's Name_KEY_...

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