4. (2 pts.) The lac operon consists of a Promoter (P), Operator
(O), B-galactosidase gene (Z), permease gene (Y) and transacetylase
gene (A), and is regulated by a repressor (I). The promoter,
operator, B-galactosidase, and permease genes are required for the
metabolism of lactose. Different strains of bacteria were tested in
the lab and the following results were obtained. Match the
genotypes of the bacterial strains with regards to the P, O, Z, Y,
and I genes.
A. I+ P+ Oc Z+ Y- / I- P+ O+ Z+ Y+
B. I- P+ O+ Z- Y+ / I+ P+ O+ Z+ Y-
C. I- P+ O+ Z- Y- / I+ P- O+ Z+ Y-
D. I+ P+ O+ Z+ Y-/ I+ P- O+ Z+ Y+
|
B-Galactosidase (Z) |
Permease (Y) |
||||
|
Strain |
Genotype |
Noninduced |
Induced |
Noninduced |
Induced |
|
1 |
– |
– |
– |
– |
|
|
2 |
+ |
+ |
– |
+ |
|
|
3 |
– |
+ |
– |
+ |
|
|
4 |
– |
+ |
– |
– |
|
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