RNA Polymerase SDS page shows two very large subunits: beta (b) and beta-prime (b’), with molecular masses of 150 and 160 kD, respectively.

TLS Online TPP Program

#Id: 6361

#Unit 2. Cellular Organization

Repressors bind to specific sites on the DNA. In bacterial cells, such binding sites, called operators

Regulation by means of a repressor protein that blocks transcription is referred to as negative regulation. Activators provide a molecular counterpoint to repressors; they bind to DNA and enhance the activity of RNA polymerase at a promoter; this is positive regulation.Repressor binding to DNA is regulated by a molecular signal called effector

TLS Online TPP Program

#Id: 1574

#Unit 4. Cell Communication and Cell Signaling

Binding of Wnt to its receptor Frizzled (Fz) and to the LRP co-receptor triggers phosphorylation of LRP by GSK3 and CK1, enables Axin to bind LRP & Dsh.

 

TLS Online TPP Program

#Id: 1222

#Unit 7. System Physiology – Animal

In bone, PTH receptors are located on osteoblasts but not on osteoclasts.

TLS Online TPP Program

#Id: 9399

#Unit 11. Evolution and Behavior

Imprinting

Imprinting, in psychobiology, a form of learning in which a very young animal fixes its attention on the first object with which it has visual,  auditory, or tactile experience and there after follows that object

TLS Online TPP Program

#Id: 3146

#Unit 7. System Physiology – Animal

Residual volume normal volume averages about 1200 mL