QB-Bkey - iii not expressed inducible iv constitutive...

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BIO320 Spring 2010 Answer key for question bank B OPERON STRUCTURE & REGULATION 1.E 2.D 3. One, one, one, several, several, several 4.B 5.B 6.C 7.B 8.A 9. 9.1 D 9.3 C 9.5 B 9.7 C 9.9 A 9.2 A 9.4 E 9.6 E 9.8 A 9.10 A 10.D 11.A 12.C 13.C 14.A 15.A 16.E 17.A lac OPERON; GENOTYPES<–> PHENOTYPES 18.A 19.B 20. lacI[-] P[ + ] O[ + ] Z[+] Y[ * ] / F' lacI[ + ] P[ + ] O[ C ] Z[ ] Y[ + ]. 21. lacI[-] P[ + ] O[ + ] Z[+] Y[ ] / F' lacI[ + ] P[ ] O[ * ] Z[ * ] Y[+]. * : could be + or – 22. lacZ lacY (i) high high ..in the presence of allolactose. (ii) high low ..in the absence of allolactose. 23.C 24.B 25.C 26. C 27. galactosidase permease i inducible inducible ii constitutive constitutive
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Unformatted text preview: iii not expressed inducible iv constitutive inducible GLUCOSE USE; CATABOLITE REPRESSION 28.C 29.A 30.C 31.C 32.B 33. positive regulatory site promoter operator Time 1 unoccupied unoccupied unoccupied Time 2 CRP RNA polymerase unoccupied 34a. AraC[–] I2[ + ] P[+] B[–] A[ + ] D[ + ] 34b. allostery 34c. decreased F’ AraC[ + ] I2[–] P[+] B[+] A[*] D[*] * : could be + or – 35. A 36. E 37. trpE trpD (i) yes no ..in the presence of tryptophan (ii) yes no ..in the absence of tryptophan 38a. corepressor (trp molecule), repressor, operator, promoter, structural gene(s) b. The repressor shows allostery. 39.E 40.D 41.E 42.C...
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This note was uploaded on 04/21/2010 for the course BIO 89329 taught by Professor Hollingsworth during the Spring '10 term at SUNY Stony Brook.

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