The wild-type E. coli cells are growing in a normal medium with glucose. They are transferred to a medium containing only lactose as sugar. Which of the following changes takes place?
Correct answer: A. The lac operon is induce
- A. The lac operon is induce
- B. E.coli cells stop dividing
- C. The lac operon is repressed
- D. All operons are induced
Explanation
When E.coli bacteria are transferred to a medium containing lactose, the lac operon is induced. The lac operon consists of 3 structural genes (lac Z, lac Y, and lac A). It involves the synthesis of the b-galactosidase enzyme in E.coli, which hydrolyses lactose into glucose and galactose.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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