TLS Online TPP Program

#Id: 6311

#Unit 3. Fundamental Processes

he consequences of arrest can be catastrophic if the gene being transcribed is essential as no product will be made by the arrested polymerase, and that same enzyme will cause a roadblock to other polymerases attempting to transcribe the same gene.The cell has machinery that removes the arrested polymerase and at the same time recruits repair enzymes (in particular, the endonuclease Uvr(A)BC); the repair that follows is called transcription-coupled repair. Both polymerase removal and repair enzyme recruitment are performed by a single protein called TRCF.

TLS Online TPP Program

#Id: 3615

#Unit 3. Fundamental Processes

The degeneracy of the code is not uniform. Whereas methionine and tryptophan have single codons, for example, three amino acids (Arg, Leu, Ser) have six codons, five amino acids have four, isoleucine has three, and nine amino acids have two.

TLS Online TPP Program

#Id: 6813

#Unit 8. Inheritance Biology

Polygenic Inheritance - Multiple gene one function 

TLS Online TPP Program

#Id: 1421

#Unit 4. Cell Communication and Cell Signaling

Integrins bind extracellular matrix (ECM) glycoproteins, 1. Laminins  

2. Collagens 

3. Fibronectin

4. Vitronectin

TLS Online TPP Program

#Id: 1012

#Unit 5. Developmental Biology

In mammals, the bipotential gonad appears to be moved into the male pathway (testis development) by the Sry gene (on the Y chromosome), which triggers the activity of Sox9.