transversions, which are pyrimidine-to-purine and purine-to-pyrimidine substitutions, such as T to G or A and A to C or T.

TLS Online TPP Program

#Id: 2246

#Unit 11. Evolution and Behavior

Some people have an allele called Δ32 at the CCR5 locus in which 32 bp are deleted.

CCR5 that plays a role in inflammatory response. Unfortunately, this protein is also a key to human immunodeficiency virus (HIV) infection. The virus binds to a loop of the CCR5 protein and then enters the cell.

The missing part of the gene codes for the loop in the protein to which the virus attaches. 

TLS Online TPP Program

#Id: 8321

#Unit 2. Cellular Organization

Elongation phase

short oligomer rapidly increases in length by the addition of actin monomers to both of its ends, causing filament elongation

TLS Online TPP Program

#Id: 10456

#Unit 4. Cell Communication and Cell Signaling

A highly specific inhibitor imatinib (Gleevec), which

binds directly to the active site of the ABL kinase and holds it in an inactive conformation to inhibit its kinase activity, is lethal to CML cells

TLS Online TPP Program

#Id: 3974

#Unit 2. Cellular Organization

E. coli has at least four individual topoisomerases (I through IV). Those of type I (topoisomerases I and III) generally, relax DNA by removing negative supercoils (increasing Lk).

TLS Online TPP Program

#Id: 6577

#Unit 7. System Physiology – Animal

When the embryo has functional testes, Leydig cells of the fetal testis secrete testosterone, and the Sertoli cells secrete MIS (MRF)