Suppose you have a bacterial strain with the following genotype for the lac operon. How is this lac operon regulated? I- P+ O+ Z+ Y-
The operon is non inducible, and lacZ is never transcribed, even in the presence of lactose.
The operon is constitutive, and lacZ is transcribed even when lactose is absent.
The operon is inducible, and lacZ is transcribed only in the presence of lactose.
The operon is repressible, and lacZ is only expressed in the absence of lactose.
The operon is constitutive, and both lacZ and lacY are expressed all the time.
Suppose you have a bacterial strain with the following genotype for the lac operon. How is this lac operon regulated? I- P+ O+ Z+ Y-
| The operon is non inducible, and lacZ is never transcribed, even in the presence of lactose. | ||
| The operon is constitutive, and lacZ is transcribed even when lactose is absent. | ||
| The operon is inducible, and lacZ is transcribed only in the presence of lactose. | ||
| The operon is repressible, and lacZ is only expressed in the absence of lactose. | ||
| The operon is constitutive, and both lacZ and lacY are expressed all the time. |
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Related textbook solutions
Related questions
1.In the bacterial lac repressor, which of these occurs:
| A.In the presence of glucose and the absence of lactose, the repressor is actively produced. | ||
| B.The lac operon can be hyper-induced in the presence of low glucose by the 'cAMP binding protein' (CAMP). | ||
| C.In the presence of lactose and the absence of glucose the lac operon is repressed. | ||
| D.Allolactose is a byproduct of β-galactosidase, indicating high lactose when it builds up. |
2 In eukaryotes the enhancer elements can be quite a distance upstream or downstream from the promoter, and transcriptional regulation is helped by protein:protein interactions.
True
False
2. A lac operon of genotype lacI+ lacP+ lacO+ lacZ+ lacY- will produce b-galactosidase BUT NOT permease when | ||||||||||||||
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