Biology

The correct answer is: A.Gene expression.

One of the main functions of the cell nucleus is to regulate gene expression. It contains the cell’s DNA, which carries the instructions for making proteins. By controlling which genes are turned on or off, the nucleus regulates the synthesis of specific proteins at the right time, which is crucial for cellular function and development.

Here’s why the other options are incorrect:

B.Energy production: This is the role of the mitochondria, not the nuc...