Two-component system regulating response to low Gln,

a) Glutamine dissociates from the sensor domain in the NtrB protein, leading to activation of a histidine kinase transmitter domain in NtrB

b) glutamine binds to a sensor domain of NtrB, causing a conformational change in the protein that inhibits its histidine kinase activity, the regulatory domain of NtrC blocks its DNA-binding domain from binding the glnA enhancers.

c) Activated transmitter domain of NtrB that transfers the γ-phosphate of ATP to a histidine residue (H), this phosphohistidine then transfers the phosphate to an aspartic acid residue (D) in the NtrC protein

d) This causes a conformational change in NtrC that unmasks the NtrC DNA-binding domain so that it can bind to the glnA enhancers

Which of the following combination is correct?

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#Question id: 7100

#Unit 5. Developmental Biology

If cells from the animal pole of a frog blastula (animal cap cells) are placed into contact with cells from the vegetal hemisphere, after removing the cells fated to form mesoderm, what is the result?

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#Question id: 2502

#Unit 2. Cellular Organization

The important role that intermediate filaments play in the epithelial cells of the skin is evident in which of the following?

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#Question id: 31054

#Unit 4. Cell Communication and Cell Signaling

Active Raf subsequently phosphorylates activation loop of MEK on one or two:

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#Question id: 28444

#Unit 5. Developmental Biology

Six of precursor blast cells (P cells) persist in the larva in a row aligned antero-posteriorly on the ventral side of the larva, and posterior daughters of three of these precursor blast cells (P cells) give rise to the vulva. these precursor cells are___

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#Question id: 5205

#Unit 11. Evolution and Behavior

Why is it preferable to use large computers and databases in searching for individual genes, rather than testing each sequence for possible function?