Hensen’s node (Primitive Knot)

TLS Online TPP Program

#Id: 3215

#Unit 3. Fundamental Processes

Ultraviolet irradiation causes dimer formation between adjacent thymines. The dimer blocks replication and transcription. 

TLS Online TPP Program

#Id: 3217

#Unit 3. Fundamental Processes

The Uvr system makes incisions -12 bases apart on both sides of damaged DNA, removes the DNA between them, and resynthesizes new DNA.

TLS Online TPP Program

#Id: 3219

#Unit 3. Fundamental Processes

Transcribed genes are preferentially repaired when DNA damage occurs.

TLS Online TPP Program

#Id: 3222

#Unit 3. Fundamental Processes

Transcribed genes are preferentially repaired when DNA damage occurs.

TLS Online TPP Program

#Id: 3224

#Unit 3. Fundamental Processes

Xeroderma pigmentosum (XP) is a human disease caused by mutations in any one of several nucleotide excision repair genes.

TLS Online TPP Program

#Id: 3226

#Unit 3. Fundamental Processes

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