Certain mutations in the regulator gene of the lac system in E. coli result in maximal synthesis of the Lac proteins (?-galactosidase, etc.) even in the absence of the inducer (lactose). Provide an explanation for this observation

What will be an ideal response?


There has been a mutation in the gene that produces the repressor, or the operator is mutated so that it will not interact with the repressor.

Biology & Microbiology

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In the accompanying figure, a(n) ________ glacier is out away from mountains into the lowlands.

Biology & Microbiology

The process where two gametes fuse with each other in the process of fertilization to begin the life of a new organism is called

A. sexual reproduction. B. gametogenesis. C. asexual reproduction. D. X-linked inheritance. E. multicellularity.

Biology & Microbiology

The sense of balance relies on information from all of the following EXCEPT ____

a. eyes b. cochlea c. skin d. joints e. vestibular apparatus

Biology & Microbiology

In a lichen, the fungal partner ________.

A. provides a substratum within which the alga grows B. protects the alga from excess light intensities C. provides water and minerals to the alga D. All of the choices are correct.

Biology & Microbiology