#Question id: 11516
#Unit 10. Ecological Principles
What type of survivorship curve do humans have?
#Question id: 2018
#Unit 4. Cell Communication and Cell Signaling
What aspect of the immune response would a patient who has a parasitic worm infection and another patient responding to an allergen such as ragweed pollen have in common?
#Question id: 1102
#Unit 4. Cell Communication and Cell Signaling
Caffeine is an inhibitor of phosphodiesterase. Therefore, the cells of a person who has recently consumed coffee would have increased levels of which of the following molecules?
#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: 32311
#Unit 2. Cellular Organization