Smad7 binds to the activated RI receptors and blocks its ability to phosphorylate Smad2 or Smad3. 

TLS Online TPP Program

#Id: 9283

#XL - Q Biochemistry

Three factors are important in maintaining low O2 concentrations in nodules. 

First, entry of O2 into the nodule is controlled by a variable‐permeability barrier in the nodule parenchyma

TLS Online TPP Program

#Id: 8428

#XL - T Zoology

Natural selection will favor those individuals that allocate their resources in a way that achieves maximum fitness.

TLS Online TPP Program

#Id: 8640

#XL - T Zoology

In vertebrates, Rb is the major guardian of the cell cycle, integrating information about DNA damage and cell growth

TLS Online TPP Program

#Id: 9464

#XL - T Zoology

The SH2 domain binds strongly to short target peptides containing a critical four-residue core sequence:: 

phosphotyrosine–glutamic acid–glutamic acid–isoleucine

TLS Online TPP Program

#Id: 8541

#XL - Q Biochemistry

The dependent variable is the rate of the reaction. 

The independent variables are the concentration of enzyme, the concentration of the substrate, the temperature, and the addition of an inhibitor