All proteins found in the nucleus, histones, transcription factors,  DNA & RNA polymerases are synthesized in the cytoplasm and imported into the nucleus through nuclear pore complexes.

TLS Online TPP Program

#Id: 7033

#Unit 11. Evolution and Behavior

TLS Online TPP Program

#Id: 5191

#Unit 7. System Physiology – Animal

Activated factor IX forms a complex with active factor VIII, which is activated when it is separated from von Willebrand factor.

TLS Online TPP Program

#Id: 5888

#Unit 3. Fundamental Processes

Incorrect base pairing leads to dramatically lower rates of nucleotide addition as a result of a catalytically unfavorable alignment of these substrates. This is an example of kinetic proofreading, in which an enzyme favors catalysis using one of several possible substrates by dramatically increasing the rate of bond formation only when the correct substrate is present. 

TLS Online TPP Program

#Id: 8164

#Unit 2. Cellular Organization

Vesicles coated with GGA proteins and clathrin bind to proteins containing 

Asp-X-Leu-Leu and Asp-Phe-Gly-X-Φ sequences

TLS Online TPP Program

#Id: 5950

#Unit 10. Ecological Principles

Trophic-level transfer efficiency is low for the two reasons

a- Many organisms cannot digest all their prey.  

b- Much of the energy assimilated by animals is used in maintenance.

c- The dead organisms and feces become dinner for decomposers.