The N gene codes for an antitermination factor whose action at nut (N utilization) sites allows transcription to proceed into the delayed early genes

 

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#Id: 2374

#Unit 5. Developmental Biology

An anterior-to-posterior gradient of Erk signaling functions as a positive inducer of head specification

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#Id: 2530

#Unit 13. Methods in Biology

The specificity of the PCR depends crucially upon the primers. The following factors are important in choosing effective primers

Primers should be 17 to 30 nucleotides in length

A GC content of about 50% is ideal. For primers with a low GC content, it is desirable to choose a long primer to avoid a low melting

 temperature.

Sequences with long runs (i.e., more than three or four) of a single nucleotide should be avoided.

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#Id: 1438

#Unit 4. Cell Communication and Cell Signaling

Desmosomes

Adhesion type- Cell-cell

Cytoskeletal attachment- Intermediate filaments

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#Id: 3720

#Unit 10. Ecological Principles

Clement’s organismic model - Competition causes sharp boundaries between groups of species; certain species group together.

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#Id: 5310

#Unit 7. System Physiology – Animal

During isovolumetric Ventricular contraction, the volume of the ventricle does not change because all valves are closed.