A yellow tetrazole is reduced by metabolically active cells to form insoluble, purple formazan dye crystals detected at 570nm. For this phenomenon which of the following compound should be uptake by cell

#Question id: 5001

#Unit 11. Evolution and Behavior

Fossil evidence indicates that several kinds of flightless dinosaurs possessed feathers. If some of these feather-bearing dinosaurs incubated clutches of eggs in carefully constructed nests, this might be evidence supporting the claim that

#Question id: 32241

#Unit 2. Cellular Organization

#Question id: 3048

#Unit 2. Cellular Organization

 If a bacterium regenerates from an endospore that did not possess any of the plasmids that were contained in its original parent cell, the regenerated bacterium will probably

#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: 28634

#Unit 2. Cellular Organization

Rb protein in mammalian cells is analogous to