Ordovician - Primitive plants and fungi colonize land, first jawless vertebrates,  Mass extinction at end of period

TLS Online TPP Program

#Id: 3511

#Unit 2. Cellular Organization

Introns may more freely accumulate point substitutions and other changes due to no selection pressure.  Introns evolve or accumulate mutations/changes much more rapidly than exons

TLS Online TPP Program

#Id: 2897

#Unit 3. Fundamental Processes

The origin of the replication region remains attached to the membrane for about one-third of the cell cycle as another part of the mechanism to prevent reinitiation.

TLS Online TPP Program

#Id: 1278

#Unit 7. System Physiology – Animal

Addison disease (primary adrenocortical insufficiency) caused by autoimmune destruction of all zones of the adrenal cortex.

TLS Online TPP Program

#Id: 5500

#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 2939

#Unit 3. Fundamental Processes

Hda recruited, it acts to switch offDnaA, preventing a second round of replication.