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TLS Online TPP Program

#Id: 10286

T cells initiate the adaptive immune response by interacting MHC on antigen-presenting cells that have been exposed to pathogens. 

#Section 2: General Biology #T cells #Part B Pointers
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TLS Online TPP Program

#Id: 9287

#Section 2: General Biology
TLS Online TPP Program

#Id: 7749

#Section 2: General Biology

    
TLS Online TPP Program

#Id: 7748

#Section 2: General Biology

Zeff=Z –S

Chlorine would have a Z value of 17 (the atomic number of Chlorine). Continuing to use Chlorine as an example, the 10 inner electrons (S) would screen out the positive charge of ten protons. Therefore there would be and effective nuclear charge of 17-10 or +7.
TLS Online TPP Program

#Id: 8978

#Section 3: Genetics, Cellular and Molecular Biology

Proportion of base pairs that differ between sequences(D) 

D= 2rt

r  = rate of divergence per base pair per million  

T = time
TLS Online TPP Program

#Id: 3775

#Section 2: General Biology

The electrons revolve in orbits around the nucleus.