If a mutation prevents the formation of the antiterminator 2+3 loop in the trp operon, what would be the effect?

A. no effect, as 2+3 loop has no function
B. transcription only when tryptophan is absent
C. transcription only when tryptophan is present
D. constitutive attenuation of transcription
E. constitutive transcription


Ans: D. constitutive attenuation of transcription

Biology & Microbiology

You might also like to view...

Many species in the phylum Crenarchaeota are considered extreme thermophiles or _______, which can grow at temperatures above 100°C.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

The function of synovial fluid is to:

a. store calcium b. reduce friction c. produce marrow d. carry nutrients e. resorb bone

Biology & Microbiology

In the human life cycle,

a. diploid gametes reproduce by mitosis to produce diploid daughter cells that divide by meiosis to produce a new individual. b. a haploid zygote reproduces by meiosis to produce diploid daughter cells that divide by mitosis to produce a new individual. c. mitosis produces haploid gametes, and fertilization creates a diploid cell that divides by meiosis to produce a new individual. d. meiosis produces haploid gametes, and fertilization creates a diploid cell that divides by mitosis to produce a new individual. e. diploid gametes reproduce by meiosis to produce haploid daughter cells that divide by mitosis to produce a new individual.

Biology & Microbiology

________ are complex communities of various types of microbes that adhere to surfaces

A) Aggregates B) Colonies C) Isolates D) Biofilms E) Media

Biology & Microbiology