QB08-Bkey - GLUCOSE USE; CATABOLITE REPRESSION 26.C 27.A...

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BIO320 Spring 2007 Answer key for question bank B I. SIGMA PROTEINS; OPERON STRUCTURE & REGULATION 1. E 2. D 3. B 4. B 5. B 6. C 7. A 8. A 9. B 10.C 11.C 12.A 13.A 14. A II. lac OPERON; GENOTYPES<–> PHENOTYPES 15. lacI 16.B 17. lacI[-] P[ + ] O[ + ] Z[+] Y[ * ] / F' lacI[ + ] P[ + ] O[ C ] Z[ ] Y[ + ]. 18. lacI[-] P[ + ] O[ + ] Z[+] Y[ ] / F' lacI[ + ] P[ ] O[ * ] Z[ * ] Y[+]. * : could be + or – 19. lacZ lacY (i) high high . .in the presence of allolactose. (ii) high low ..in the absence of allolactose. 20.C 21.B 22.C 23. C 25. Graph 2 24. galactosidase permease i inducible inducible ii constitutive constitutive iii not expressed inducible iv constitutive inducible
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Unformatted text preview: GLUCOSE USE; CATABOLITE REPRESSION 26.C 27.A 28.C 29.C 30.B 31.E 32.E 33. C 34.E 35. E 36. trpE trpD (i) yes no ..in the presence of tryptophan (ii) yes no ..in the absence of tryptophan 37a. corepressor (trp molecule), repressor, operator, promoter, structural gene(s) b. The repressor shows allostery. 38a. AraC I2[ + ] P[+] B A[ + ] D[ + ] F AraC[ + ] I2 P[+] B[+] A[*] D[*] * : could be + or 38b. allostery 38c. decreased 39. D 40. positive regulatory site promoter operator Time 1 unoccupied unoccupied unoccupied Time 2 CRP RNA polymerase unoccupied 41. time after 1 A time after 1 D E time after 1 B C...
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This note was uploaded on 09/28/2009 for the course BIO 320 taught by Professor N/a during the Spring '08 term at SUNY Stony Brook.

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