Unlike pluripotent stem cells, adult or multipotent stem cells in culture not only have a restricted array of cell types that they can create, but they also have a finite number of generations for self-renewal.

TLS Online TPP Program

#Id: 6142

#Unit 3. Fundamental Processes

transcription-coupled repair (TC-NER) TFIIH, itself a large complex, which includes the products of two XP genes, XPB and XPD. 

TLS Online TPP Program

#Id: 6870

#Unit 3. Fundamental Processes

Rap1 recruits Sir4 on acetylated histones, then recruits both its binding partner Sir3 and the HDAC Sir2. 

Sir3 and Sir4 then interact directly with histones H3 and H4. Once Sir3 and Sir4 have bound to histones H3 and H4, 

Sir2 deacetylates histones

Sir2-dependent deacetylation represses transcription.

TLS Online TPP Program

#Id: 3502

#Unit 2. Cellular Organization

Interrupted gene: Mutations in exons can affect polypeptide sequence; mutations in introns can affect RNA processing and hence may influence the sequence and/or production of a polypeptide.

TLS Online TPP Program

#Id: 5555

#Unit 7. System Physiology – Animal

Type A intercalated cells  secrete hydrogen ions by a hydrogen-ATPase transporter and by a hydrogen-potassium-ATPase transporter are especially important in eliminating hydrogen ions while reabsorbing bicarbonate in acidosis

TLS Online TPP Program

#Id: 7756

#Unit 1. Molecules and their Interaction Relevant to Biology

Fluorine (the most electronegative element) is assigned a value of 4.0, and values range down to cesium and francium which are the least electronegative at 0.7