Biomes:  A biome is a collection of ecosystems sharing similar climatic conditions. A biome has distinctive abiotic factors and species which distinguish it from other biomes.

TLS Online TPP Program

#Id: 2954

#Unit 3. Fundamental Processes

By counting the number of sites to which ORC binds, we can estimate that there are about 400 origins of replication in the yeast genome. This means that the average length of a replicon is -35,000 bp.

TLS Online TPP Program

#Id: 6504

#Unit 3. Fundamental Processes

Once bound to Pol II, Ptefb phosphorylates the serine residue at position 2 of the CTD repeats. That phosphorylation event correlates with elongation. In addition, P-TEFb phosphorylates and thereby activates another protein, called SPT5, itself an elongation factor. Finally, TAT-SF1, yet another elongation factor, is recruited by P-TEFb. Thus, P-TEFb stimulates elongation in three separate ways.

TLS Online TPP Program

#Id: 5881

#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 9656

#Unit 4. Cell Communication and Cell Signaling

Feedback regulation by MAP Kinase

Active MAP kinase phosphorylates Raf on multiple sites, reducing its association with Ras.

TLS Online TPP Program

#Id: 9235

#Unit 6. System Physiology – Plant

The C4 pathway, involving mesophyll cells and bundle-sheath cells, predominates in plants of tropical origin.