There are 4 genes (I, Z, Y, A), 2 Promoters and 3 lac operators in Lac operon

The major O1 lac operator lies adjacent to promoter

Two auxiliary O2 and O3 lac operators 

All three operators are required for optimum repression 

TLS Online TPP Program

#Id: 9180

#Unit 11. Evolution and Behavior

Average fitness

In a species, only 1 of every 1000 seeds survives to reproductive age, and that those that survive produce an average of 3000 seeds. 

TLS Online TPP Program

#Id: 9472

#Unit 4. Cell Communication and Cell Signaling

Two mechanisms for terminating cytokine signaling:

1. Short-term regulation: SHP1

2. Long-term regulation: SOCS proteins

TLS Online TPP Program

#Id: 8037

#Unit 1. Molecules and their Interaction Relevant to Biology

Lys & Arg have ionisation series

1------pK1-----pK2--------pKr------14

TLS Online TPP Program

#Id: 3351

#Unit 6. System Physiology – Plant

The streaming of protons through the F_o pore causes the cylinder of c subunits and the attached ϒ subunit to rotate about the long axis of ϒ, passes through the center of the α₃β₃ spheroid

TLS Online TPP Program

#Id: 2859

#Unit 13. Methods in Biology

The constructive method involved direct analysis of protein and gives absorbance at wavelength of 280 nm.