A third way that gene duplicates arise is by retrotransposition.

Here the messenger RNA from a gene is reverse-transcribed to DNA, which is then integrated into the genome.

TLS Online TPP Program

#Id: 3045

#Unit 3. Fundamental Processes

FEN 1 functions as an endonuclease, but it also has a 5 '-3' exonuclease activity. In DNA repair reactions, FEN 1 may cleave next to a displaced nucleotide and then use its exonuclease activity to remove adjacent material.

TLS Online TPP Program

#Id: 4581

#Unit 6. System Physiology – Plant

Pr, which to the human eye is blue, is converted by red light to a far-red light–absorbing form called Pfr, which is bluegreen.

TLS Online TPP Program

#Id: 1896

#Unit 4. Cell Communication and Cell Signaling

Regulatory T cells inactivate traditional T cells.

TLS Online TPP Program

#Id: 1223

#Unit 7. System Physiology – Animal

PTH stimulates osteoclast activity and bone resorption by maturation of osteoclast cells.

TLS Online TPP Program

#Id: 5852

#Unit 10. Ecological Principles