Question

For each genotype, with and without inducer, select whether or not a functional galactosidase or permease will be present. IS indicates a super-repressor (it can’t bind to lactose/inducers). OC indicates a constitutive operon (no repressor can bind to this region of DNA). I- ; Z- ; Y- each indicate an allele that does not produce a functional protein. P- indicates a mutation in the promoter region such that RNA polymerase does not bind. Group of answer choices

I+ P+ O+ Z+ Y+ Inducer absent. B-galactosidase present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I+ P+ O+ Z+ Y+ Inducer absent. Permease present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I+ P+ O+ Z+ Y+ Inducer present. B-galactosidase present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I+ P+ O+ Z+ Y+ Inducer present. Permease present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I+ P+ O+ Z- Y+ Inducer absent. B-galactosidase present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I+ P+ O+ Z- Y+ Inducer absent. Permease present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I+ P+ O+ Z- Y+ Inducer present. B-galactosidase present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I+ P+ O+ Z- Y+ Inducer present. Permease present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I+ P+ O+ Z+ Y- Inducer absent. B-galactosidase present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I+ P+ O+ Z+ Y- Inducer absent. Permease present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I+ P+ O+ Z+ Y- Inducer present. B-galactosidase present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I+ P+ O+ Z+ Y- Inducer present. Permease present?       [ Choose ]            Yes, functional protein present            No, functional protein not present   

I- P+ OC Z+ Y- Inducer absent. B-galactosidase present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I- P+ OC Z+ Y- Inducer absent. Permease present?       [ Choose ]            Yes, functional protein present            No, functional protein not present   

I- P+ OC Z+ Y- Inducer present. B-galactosidase present?       [ Choose ]            Yes, functional protein present            No, functional protein not present      

I- P+ OC Z+ Y- Inducer present. Permease present?

Answer 1

The Lac operon is an inducible operon activated by the presence of lactose.

1. I+ P+ O+ Z+ Y+:
Inducer absent: B-galactosidase functional protein is not present

2. I+ P+ O+ Z+ Y+
Inducer absent: Permease functional protein is not present

3. I+ P+ O+ Z+ Y+
Inducer present: B-galactosidase functional protein is present

4. I+ P+ O+ Z+ Y+   
Inducer present: Permease functional protein is present

5. I+ P+ O+ Z- Y+   
Inducer absent: B-galactosidase functional protein is not present

6. I+ P+ O+ Z- Y+
Inducer absent: Permease functional protein is not present

7. I+ P+ O+ Z- Y+
Inducer present: B-galactosidase functional protein is not present

8. I+ P+ O+ Z- Y+
Inducer present: Permease functional protein is present

9. I+ P+ O+ Z+ Y-
Inducer absent: B-galactosidase functional protein is not present

10. I+ P+ O+ Z+ Y-
Inducer absent: Permease functional protein is not present

11. I+ P+ O+ Z+ Y-
Inducer present: B-galactosidase functional protein is present

12. I+ P+ O+ Z+ Y-   
Inducer present: Permease functional protein is not present

13. I- P+ OC Z+ Y-   
Inducer absent: B-galactosidase functional protein is present

14. I- P+ OC Z+ Y-
Inducer absent: Permease functional protein is not present

15. I- P+ OC Z+ Y-
Inducer present: B-galactosidase functional protein is present

16. I- P+ OC Z+ Y- Inducer present. Permease present?
Inducer present: Permease functional protein is not present