Many bacterial responses are controlled by two component regulatory systems. What will happen at the high concentration of glutamine and at the low concentration of glutamine?

a) At high concentrations glutamine binds to a sensor domain of NtrB conformational change in the protein that inhibits its histidine kinase activity

b) NtrC phosphorylation takes place causes a conformational change in NtrC that unmasks the NtrC DNA-binding domain so that it can bind to the glnA enhancers

c) At the same time, the regulatory domain of NtrC blocks its DNA-binding domain from binding the glnA enhancers

d) At low concentrations of glutamine dissociates from the sensor domain in the NtrB protein, leading to activation of a histidine kinase transmitter domain

Which of the following given combination is correct?

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#Question id: 9609

#Unit 9. Diversity of Life Forms

Dozens of potato varieties exist, differing from each other in potato-tuber size, skin color, flesh color, and shape. One might construct a classification of potatoes based on these morphological traits. Which of these criticisms of such a classification scheme is most likely to come from an adherent of the phylocode method of classification?

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#Question id: 15996

#Unit 12. Applied Biology

Hairy root cultures are induced by___

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#Question id: 20271

#Unit 7. System Physiology – Animal

Nephrogenic diabetes insipidus is treated with thiazide diuretics. The usefulness of thiazide diuretics in treating nephrogenic diabetes insipidus is explained as follows:

a. Thiazide diuretics inhibit Na+ reabsorption in the early distal tubule. By preventing dilution of the urine at that site, the final, excreted urine is less dilute.

b. Thiazide diuretics decrease glomerular filtration rate; because less water is filtered, less water is excreted.

c. Thiazide diuretics, by increasing Na+ excretion, can cause a secondary ECF volume contraction.

Which one of the following combination of above statements is correct?

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#Question id: 5700

#Unit 8. Inheritance Biology

During meiosis, homologous chromosomes pair up along their lengths. The most plausible explanation for the karyotype structure shown above is that

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#Question id: 756

#Unit 1. Molecules and their Interaction Relevant to Biology

The thermal denaturation of DNA may be reversed by cooling the solution. Rapid cooling allows: