$E. coli$ cells with a mutated $Z$ gene of the $lac$ operon cannot grow in a medium containing only lactose as the source of energy because:
- AIn the presence of glucose,$E. coli$ cells do not utilize lactose.
- BThey cannot transport lactose from the medium into the cell.
- CThe $lac$ operon is constitutively active in these cells.
- DThey cannot synthesize functional $\beta$-galactosidase.
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$A$ gene that is responsible for the synthesis of a polypeptide chain is called a .......
Medium
View SolutionLac-operon is an example of which one of the following types of regulation of gene expression?
Consider the following statements of gene regulation and select the correct statements $:$
$(A)$ Expression of genes is regulated by metabolic,physiological,or environmental conditions.
$(B)$ Galactose can act as an inducer for the lac operon.
$(C)$ The operator region is adjacent to the promoter elements in most operons.
$(D)$ In the lac operon,lactose is transported into the cell through the action of permease.
$(E)$ Regulation of the lac operon by a repressor is referred to as positive regulation.
$(A)$ Expression of genes is regulated by metabolic,physiological,or environmental conditions.
$(B)$ Galactose can act as an inducer for the lac operon.
$(C)$ The operator region is adjacent to the promoter elements in most operons.
$(D)$ In the lac operon,lactose is transported into the cell through the action of permease.
$(E)$ Regulation of the lac operon by a repressor is referred to as positive regulation.
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View SolutionRepressor protein is formed from
Medium
View SolutionWhich enzyme is responsible for the transport of lactose into the cell?
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