Molecular Basis of Inheritance Question 148

148. The wild type $E$. coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as sugar. Which of the following changes takes place?

[1995]

(a) The lac operon is repressed

(b) All operons are induced

(c) The lac operon is induced

(d) E.coli cells stop dividing

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Answer : c

Hints & Solution

(c) If Escherichia coli bacteria grow in normal glucose medium and when transferred to a medium containing lactose, then the lac operon is induced.