In secondary neurulation, 

the neural tube arises from the aggregation of mesenchyme cells into a solid cord that subsequently forms cavities that coalesce to create a hollow tube.

 

TLS Online TPP Program

#Id: 791

#Unit 3. Fundamental Processes

A rut site has a sequence rich in C -41% and poor in G preceding the actual site(s) of termination. The sequence corresponds to the 3’ end of the RNA.

 

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#Id: 874

#Unit 13. Methods in Biology

Touchdown PCR, has been devised to increase the specificity of PCR without lowering the efficiency by variation annealing temperature.

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#Id: 5794

#Unit 7. System Physiology – Animal

Tyrosine is first iodized to monoiodotyrosine and then to diiodotyrosine. Then, more and more of the iodotyrosine residues become coupled with one another

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#Id: 3226

#Unit 3. Fundamental Processes

Numerous proteins, including XP products and the transcription factor TFnH, are involved in eukaryotic nucleotide excision repair. 

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#Id: 5722

#Unit 10. Ecological Principles

Ecotypes, individuals of a species that vary in external appearance and their variations are genetically fixed and irreversible The individuals of a species growing under different environmental conditions differ in external appearance, but these changes are only temporary, not permanent, and hence reversible Ecads (Ecophenes).