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Which of the following statements accurately describes the regulation of the lac operon and the human genome? In negative regulation, a repressor protein attaches to the operon’s operator site, halting transcription. Positive regulation involves an activator protein assisting RNA polymerase at the promoter region to start transcription. The human genome consists of approximately 20,000-25,000 genes and billions of base pairs.

1. (a)
2. (b)
3. (c)
4. (d)

Correct answer: (d)

Solution

Statement A and D are correct. Lac operon regulation by repressors is an example of negative regulation, where the repressor binds to the operator to block transcription. Additionally, the human genome contains approximately 20,000-25,000 genes.

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