E.coli cells with a mutated $Z$ gene of the lac operon cannot grow in medium containing only lactose as the source energy because

  • [AIPMT 2005]
  • A

    In the presence of glucose, E.coli cells do not utilize lactose

  • B

    They cannot transport lactose from the medium into the cell

  • C

    The lac operon is constitutively active in these cells

  • D

    They cannot synthesize functional betagalactosidase

Similar Questions

Terminator gene

Define an operon, giving an example, explain an Inducible operon.

A low level of expression of lac operon occurs at all the time. Can you explain the logic behind this phenomena.

In the lac operon, the structural genes are switched off when

In Operon concept, the regulator gene regulates chemical reactions in the cell by

  • [AIIMS 1985]