Question

which of the following best describes gene regulation?
making more genes
turning genes on or off as needed
changing the dna sequence
breaking down mrna

Explanation:

Gene regulation is the process by which cells control which genes are expressed (turned on) or not expressed (turned off) at a given time. Cells do not make more genes (genes are part of the fixed genome in a cell's nucleus for most somatic cells). Changing the DNA sequence is a mutation, not normal gene regulation. Breaking down mRNA is one aspect of post - transcriptional regulation but is not the overall description of gene regulation. The key concept of gene regulation is the control of gene expression by turning genes on or off as needed for the cell's function, development, and response to the environment.

Answer:

Turning genes on or off as needed