Valyl-tRNA synthetase can sterically exclude isoleucine from its catalytic pocket because isoleucine is larger than valine.

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: 2848

#Unit 13. Methods in Biology

SEC chromatographic technique for the separation of molecules on the basis of their molecular size and shape exploits the molecular sieve properties of a variety of porous materials.

TLS Online TPP Program

#Id: 9576

#Unit 11. Evolution and Behavior

Pre Cambrian- Earliest eukaryotes and multicellular eukaryotes. Oxygen levels increase

TLS Online TPP Program

#Id: 5459

#Unit 7. System Physiology – Animal

Depolarization in myelinated axons travels from one node of Ranvier to the next, this “jumping” of depolarization from node to node is called

saltatory conduction

TLS Online TPP Program

#Id: 4486

#Unit 13. Methods in Biology

Atrial repolarization is not seen on a normal ECG because it is “buried” in the QRS complex.