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MCB 121 Spring 2010 Midterm 1 Test Form A KEY This exam is worth 100 points There are 30 questions broken into 5 different sections (I-V) ANSWERS A...

can you answer question 1-4

1 MCB 121 Spring 2010 Midterm 1 Test Form A KEY This exam is worth 100 points There are 30 questions broken into 5 different sections (I-V) ANSWERS TEST FORM A B C Problem 1. D C E 2. B D B 3. D D D/E 4. C B D 5. E A B 6. B B E 7. D/E C D A 8. D B C 9. C D B 10. D D D 11. D B B 12. B D A 13. A B C 14. B D D 15. D C A 16. B E C 17. D B D 18. D D/E D 19. B D B 20. B B A 21. E E B 22. A A B D 23. C C B 24. B B D 25. D D D 26. B B B 27. A A D 28. C C B 29. D D D 30. A A C Exam Statistics (after adjustment) #Students Hi Low Mean Test Form A 61 99 25 67 Test Form B 58 100 31 69 Test Form C 58 100 21 74 Combined A-C 177 100 21 69 Note: Based on a statistical analysis of the exam results, two problems (in bold face & underlined) were deemed exceptionally difficult for the upper performing students. Therefore, the total number of points for these problems (6) will be issued to all students, with the provision that no final score will be above 100 points. Also, 3 points will awarded for Problem 8 (FormA)/ 19 (FormB)/ 4 (FormC) because of an error in the choices you are asked to consider. Again, no final score may be higher than 100 points.
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2 I) (Questions 1-4) (12 points) Consider the following (simplified) pathways for head and tail formation for bacteriophage T4: One new temperature sensitive mutant (Gene X) of T4 has been isolated. All indications are that this mutant represents a new gene that has not been implicated before in T4 assembly. This mutant produces a complete and functional virus following infection of E. coli at 20°C or 30°C but not at 40°C. Following infection of E. coli at 20°C and 40°C, the following structures are observable in the Electron Microscope (EM): 1) (2points) Based upon the EM data alone, what possible steps might Gene X be involved in, with respect to viral assembly? a) Head maturation b) Tail maturation c) Head-tail joining d) Any of the above A number of double mutant viruses have been formed that contain the mutant gene X and several cold sensitive (cs) mutations in known genes that are involved in T4 head or T4 tail assembly.
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