Attenuation in trp gene regulation is accomplished by
A) reducing permeability of tryptophan, the effector molecule.
B) blocking expression of trp mRNA.
C) formation of secondary mRNA structures in the leader region.
D) binding with RNA polymerase.
E) repression of the trp operator.
C
You might also like to view...
Which of the following statements is correct?
A. Achaea are part of the same domain as bacteria in the classification of life. B. Archaea are typically multicellular organisms. C. Archaea are older organisms than eukaryotes. D. Archaea are made up of eukaryotic cells.
The net gain of ATP per molecule of glucose metabolized to pyruvate using Entner-Doudoroff pathway is
A. 2. B. 4. C. 1. D. 0.
Fluid in the lymphatic system, as well as interstitial fluid, is
A) derived from blood plasma. B) pumped from the left ventricle into lymphatic vessels and then back into the right atrium. C) composed mostly of formed elements from blood. D) the liquid portion of fluid escaping from the digestive system. E) produced by the endothelium to lubricate the interior of vascular tissue.
Transporting a substance against its concentration gradient requires
A. a transporter that is facilitated in its diffusion. B. countertransport with another molecule against its concentration gradient. C. cotransport with another molecule against its concentration gradient. D. a transporter that uses energy. E. a channel that is specific for that substance.