Asked by Why
Which molecules in eukaryotic cells regulate gene expression?
recombinant DNA
transcription factors
plasmids
lactose
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GPT-5 mini
AI
Answer: transcription factors.
Explanation:
- Transcription factors are proteins in eukaryotic cells that bind DNA and regulate transcription, so they directly control gene expression.
- Recombinant DNA is engineered DNA used in labs — not an endogenous regulator (though it can be used to alter expression experimentally).
- Plasmids are extra-chromosomal DNA elements common in bacteria (and sometimes used in yeast) and are not a normal regulatory molecule in most eukaryotic cells.
- Lactose is a sugar that induces the lac operon in bacteria (a prokaryotic regulatory system); it does not regulate gene expression in eukaryotic cells.
Explanation:
- Transcription factors are proteins in eukaryotic cells that bind DNA and regulate transcription, so they directly control gene expression.
- Recombinant DNA is engineered DNA used in labs — not an endogenous regulator (though it can be used to alter expression experimentally).
- Plasmids are extra-chromosomal DNA elements common in bacteria (and sometimes used in yeast) and are not a normal regulatory molecule in most eukaryotic cells.
- Lactose is a sugar that induces the lac operon in bacteria (a prokaryotic regulatory system); it does not regulate gene expression in eukaryotic cells.
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