Data, collected from DNAs of a great many different species, led Chargaff to the following conclusions:

A. The base composition of DNA generally varies from one species to another.

B. DNA specimens isolated from different tissues of the same species have the different base composition.

C. The base composition of DNA in a given species changes with an organism’s age, nutritional state, or changing environment.

D. In all cellular DNAs, the sum of the purine residues equals the sum of the pyrimidine residues.

Which of the above statements are INCORRECT regarding Chargaff’s rule?

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#Question id: 29079

#Unit 10. Ecological Principles

You observed the two species of barnacles, P. aurelia and P. caudatum, occupy upper and lower strata of intertidal rocks, respectively. Only when P. caudatum was removed by you from the lowers strata, P. aurelia could occupy both the upper and lower strata. From the choice given below what would be your inference from these observations.

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#Question id: 7484

#General Aptitude

The time gap between the two instants, one before and one after 12:00 noon, when the angle between the hour hand and the minute hand is 11°,is

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#Question id: 2166

#Unit 2. Cellular Organization

Typical ion/ligand concentrations are

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#Question id: 1147

#Unit 4. Cell Communication and Cell Signaling

All the following statement(s) about cholera toxin are TRUE, except:

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#Question id: 28478

#Unit 5. Developmental Biology

 Select the correct statements about these transcriptional factors-sox2, oct4 and nanog ?

a) these transcriptional factors activating those genes required to maintain totipotency in embryonic stem cells

b) these transcriptional factors activating those genes required to maintain pluripotency in embryonic stem cells

c) these transcriptional factors repressing those genes whose products would lead to differentiation