Answer:
Option (A).
Explanation:
The lac operon system in bacteria elucidates the process of lactose metabolism within the cell. The initial operon system was identified by Jacob and Monod. An operon is characterized as a cluster of genes transcribed together as a single RNA unit.
When both glucose and lactose are available in the media, the bacterium favors metabolizing glucose. The presence of glucose is recognized by the bacterial cell as the CAP-cAMP complex is essential for transcription, and its levels are reduced in glucose's presence. This mechanism effectively halts the transcription of lactose genes even when lactose is available.
Consequently, the right answer is option (A).
Saturated thickness refers to the volume of water held in an aquifer that is defined by hydrogeological characteristics. The aquifer's rock contains pores filled with water, which adds to the total water volume in the aquifer. The saturated thickness decreased from 32.77m in 1975 to 22.48m in 1990, reflecting a reduction of 10.29m. Similarly, between 1995 and 2010, the thickness diminished from 25.08m to 12.27m, a decrease of 12.81m. Although the population did not change significantly from 1975 to 1990, the notable drop in saturated thickness from 1995 to 2010 could be attributed to water conservation efforts adopted by the community or natural factors such as sufficient rainfall revitalizing the aquifer and contributions from nearby water bodies like rivers, lakes, and ponds. Conservation measures include wastewater recycling and reducing water loss.
