In the trp operon, __________ in the absence of tryptophan.

a) all of the choices are correct
b) the trp operon structural genes are transcribed
c) the operator site is open to allow RNA polymerase binding
d) the tryptophan-synthesizing enzymes of the trp operon are synthesized


Ans: a) all of the choices are correct

Biology & Microbiology

You might also like to view...

Mammals that have and care for only a few offspring are likely to exhibit a:

a. type I survivorship curve. b. type II survivorship curve. c. type III survivorship curve. d. type IV survivorship curve.

Biology & Microbiology

Intermediate filaments

A) guide the movements of chromosomes. B) surround the nucleus. C) guide the movements of organelles. D) support the inner mitochondrial membrane.

Biology & Microbiology

The cell membranes of archaeons that lack a cell wall are strengthened by ________.

A. diglycerol tetraethers B. diglycerol ethers C. glycoprotein or protein layers D. pseudomurein

Biology & Microbiology

Which is a monosaccharide?

a. glucose b. chitin c. amylose d. starch e. glycogen

Biology & Microbiology