Mitochondria is an respirosome, so it can avail oxygen out of complex IV and the oxygen used in the ETS without complex IV, always get converted into ROS.

TLS Online TPP Program

#Id: 6367

#Unit 2. Cellular Organization

This 21-bp sequence is twofold symmetric and is recognized by two subunits of Lac repressor, one binding to each half-site

TLS Online TPP Program

#Id: 6368

#Unit 2. Cellular Organization

TLS Online TPP Program

#Id: 6369

#Unit 2. Cellular Organization

When polymerase binding causes transition to the open complex and initiates transcription. This gives a low level of constitutive expression called the basal level.  Binding of RNA polymerase is the rate-limiting step in this case.

TLS Online TPP Program

#Id: 6370

#Unit 2. Cellular Organization

Lac repressor binds as a tetramer to two operators.

TLS Online TPP Program

#Id: 6371

#Unit 2. Cellular Organization

TLS Online TPP Program

#Id: 6372

#Unit 2. Cellular Organization

lacZ encodes for b-galactosidase,a tetramer of 500 kD. The enzyme breaks lactose is cleaved into glucose and galactose.  This enzyme also produces an important byproduct, b-1,6-allolactase.