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TLS Online TPP Program

#Id: 3041

Synthesis of an Okazaki fragment terminates just before the start of the RNA primer of the preceding fragment.

#Unit 3. Fundamental Processes #Unit of replication and enzymes involved #Part B Pointers
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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.
TLS Online TPP Program

#Id: 6373

#Unit 2. Cellular Organization

The lac mRNA (as most mRNA is in bacteria) is extremely unstable and decays with a half-life of only 3 minutes.