Question

what happens when a gene is turned on?
the gene becomes inactive
the cell deletes that part of dna
the cell reads the instructions and makes a protein
the dna is removed from the nucleus

Explanation:

• Analyze Option 1: A "turned on" gene is active, so this is incorrect.
• Analyze Option 2: Cells don't delete DNA when a gene is turned on; this is wrong.
• Analyze Option 3: When a gene is expressed (turned on), the cell transcribes and translates it to make a protein, matching the process.
• Analyze Option 4: DNA stays in the nucleus (in eukaryotes) during gene expression; this is incorrect.

Answer:

The cell reads the instructions and makes a protein (the third option in the list of choices).