Question

In the lac operon model of gene regulation, the word operon stands for
(a)Group
(b)Single
(c)Group of different genes
(d)Group of similar genes

Answer 1

Hint: Gene regulation includes a range of mechanisms that are used by the cells to increase or decrease the production of specific gene products. Any step of gene expression can be modulated from the post-translational modification of a protein and from the transcriptional initiation to RNA processing.

Complete answer:
In the Lac operon model of gene regulation, the word operon stands for the group. It is required for the transportation and metabolism of the lactose in E.coli and other enteric bacteria. The carbon source for most Bacteria is glucose in the Lac operon which allows the effective digestion of lactose when the glucose is not available throughout the activity of beta-galactosidase. The first genetic regulatory mechanism is the gene regulation of Lac operon. This metabolism system is used to determine the synthesis of the biological cell by an enzyme. The bacterial aprons can produce multiple proteins from one mRNA and our polycistronic transcripts which produce multiple proteins. when the lactose is required as a sugar source for the bacteria then the three genes of the lac operon get expressed and the proteins are translated. A membrane protein which is known as the beta galactoside permease gets embedded in the cytoplasmic membrane which enables the cellular transport of lactose into the cell.

Additional Information: The enzymes are not produced in the absence of lactose and are preferred as an energy source such as glucose. It uses a path control mechanism to ensure that the cell expands during the energy produced by the enzymes which are encoded by the lac operon when it is necessary. The catabolite activator protein which is required for the production of enzymes in the presence of glucose remains inactive and shuts down the lactose permease for the prevention of transport of lactose into the cell.
So, the correct answer is 'Group'.

Note: Francois Jacob and Jacques Monod were awarded the Nobel prize in the physiology of their work on the lac operon in 1965. Lac operon is present in the digestive system of humans to move the disaccharide lactose into the cell which breaks down and digest it for an energy source.