“Regulation of lac operon is referred to be negatively regulated.” Justify giving a reason.

Question

In a human female, the reproductive phase starts on the onset of puberty and ceases around middle age of the female. Study the graph given below regarding menstrual cycle and answer the questions that follow: \begin{figure}[h!] \centering \includegraphics[width=0.8\textwidth]{Screenshot 2025-01-17 101211.png} % Replace 'path_to_your_image.png' with the actual path to your graph image \caption{Graph showing the hormonal regulation and events during the menstrual cycle.} \label{fig:menstrual_cycle} \end{figure} In a normal human female, why does menstruation only occur if the released ovum is not fertilised? Explain.}

Answer 1

The lac operon is under negative regulation: In the absence of lactose, a repressor protein binds to the operator, blocking gene expression. Gene transcription commences only when lactose is present, leading to the inactivation of the repressor.

“Regulation of lac operon is referred to be negatively regulated.” Justify giving a reason.

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