Practice question
Question
An E. coli strain is grown initially on glucose as the sole carbon source. Upon complete consumption of glucose following 12 h of growth, lactose is added as the sole carbon source and the strain is further grown for 12 h. Assuming that the E. coli strain has a functional wild type lac operon, which one of the following profiles is the most ACCURATE representation of beta - galactosidase (beta -gal) expression (in arbitrary units)?
Explanation
Evidence for DNA replication fidelity indicates polymerase proofreading and origin firing ensure accurate duplication. Option D aligns with this, as it matches high-fidelity synthesis mechanisms, reflecting standard interpretations in molecular biology.
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