#Question id: 2859
#Unit 2. Cellular Organization
NtrC controls expression of genes involved in nitrogen metabolism by inducing a conformational change in a pre-bound RNA polymerase, triggering transition to the open complex.
I. Under low nitrogen level condition, NtrC is phosphorylated by a kinase, NtrB,
II. NtrC (bound to its sites upstream) interacts directly with s54. This requires that the DNA between the activator binding sites and the promoter form a loop to accommodate the interaction
III. Active NtrC binds four sites located approximately 150 bp upstream of the glnA gene.
IV. NtrC itself has an ATPase activity which provides the energy needed to induce a conformational change in polymerase.
Correct series of Activation by NtrC is;
#Question id: 3537
#Unit 8. Inheritance Biology
What is the probability of two offspring in which one dominant phenotype and one recessive phenotype from the mating Aa × Aa?
#Question id: 16327
#Unit 7. System Physiology – Animal
#Question id: 3373
#Unit 11. Evolution and Behavior
Which of the following is correct statement?
A. Reproduction alone does not alter allelic or genotypic frequencies from generation to generation
B. Frequency of the heterozygote is always greatest when allelic frequencies are range between .33 and .66
C. Inbreeding is more likely to take place in nature when population size becomes very small and the number of mates is limited.
D. The movement of a few individuals between populations can counteract the effects of genetic drift
#Question id: 26483
#Unit 2. Cellular Organization
lac repressor binds to