Principal signaling receptor for Wnt proteins is Frizzled (Fz), which contains seven transmembrane α helices.

TLS Online TPP Program

#Id: 7988

#Unit 10. Ecological Principles

Marine animals, which are hypo-osmotic, actively exclude salts. Some marine animals increase the concentrations of solutes, such as urea and amino acids, in their body fluids to match the osmotic potential of seawater and thus reduce the movement of water out of their bodies

TLS Online TPP Program

#Id: 6109

#Unit 3. Fundamental Processes

Some chemicals that cause cancers are not mutagenic to begin with, but rather are converted into mutagens by the liver, which metabolizes foreign substances. 

TLS Online TPP Program

#Id: 9071

#Unit 4. Cell Communication and Cell Signaling

Feedback mechanisms suppress signaling by the PKA pathway:

1. Intrinsic GTPase activity of Gαs

2. PDE acts to hydrolyze cAMP to 5′-AMP

3. By BARK

TLS Online TPP Program

#Id: 7408

#Unit 5. Developmental Biology

The engrailed gene is activated in cells that have high levels of the Even-skipped, Fushi tarazu, or Paired & repressed in cells that have high levels of Odd-skipped, Runt, or Sloppy-paired

TLS Online TPP Program

#Id: 5793

#Unit 7. System Physiology – Animal

“Organification” of Thyroglobulin- Iodination of tyrosine and formation of the thyroid hormones