Class II MHC glycoproteins expressed predominantly on pAPCs, where they primarily present exogenous antigenic peptides to CD4+ T cells.

TLS Online TPP Program

#Id: 8553

#Unit 1. Molecules and their Interaction Relevant to Biology

TLS Online TPP Program

#Id: 6496

#Unit 3. Fundamental Processes

TFIIH is the only general transcription factor that has multiple independent enzymatic activities. Its several activities include an ATPase, helicases of both polarities, and a kinase activity that can phosphorylate the CTD tail of RNA polymerase II (on serine 5 of the heptapeptide repeat). TFIIH is an exceptional factor that may also play a role in elongation.

TLS Online TPP Program

#Id: 2959

#Unit 3. Fundamental Processes

A nucleus injected into a Xenopus egg can replicate only once unless the nuclear membrane is permeabilized to allow subsequent replication cycles

TLS Online TPP Program

#Id: 6725

#Unit 8. Inheritance Biology

Mapping with transformation

TLS Online TPP Program

#Id: 8311

#Unit 2. Cellular Organization

Actin,

basic building block of microfilaments extraordinarily well conserved among eukaryotes.