Ku70 and Ku80 are the most fundamental components of NHEJ. They constitute a heterodimer that binds to the DNA ends and recruits DNA-PKcs, which is a protein kinase

TLS Online TPP Program

#Id: 1026

#Unit 5. Developmental Biology

Neural plate formation follow the principle of development:  often the signals promoting the specification of one cell type also block the specification of an alternative cell type.

TLS Online TPP Program

#Id: 6417

#Unit 2. Cellular Organization

The trp operon is controlled by repression and attenuation, providing a two-stage response to progressively more stringent tryptophan starvation. But attenuation alone can provide robust regulation: other amino acid operons such as leu and his rely entirely on attenuation for their control. In the case of the leucine operon, its leader peptide has four adjacent leucine codons, and the histidine operon leader peptide has seven histidine codons in a row.

TLS Online TPP Program

#Id: 8964

#Unit 11. Evolution and Behavior

A third fate that can befall a duplicated gene is neofunctionalization. Here the duplicate evolves a novel biological function. 

TLS Online TPP Program

#Id: 6330

#Unit 8. Inheritance Biology

Pseudoautosomal 

Region Small region of the X and Y chromosomes that contains homologous gene sequences.

TLS Online TPP Program

#Id: 7778

#Unit 2. Cellular Organization

Eight approximately 100-nm long filaments extend into the nucleoplasm with the distal ends of these filaments joined by a terminal ring, forming a structure called the nuclear basket.