Amensalism- One species has a strong effect on another, but the reverse effect is negligible.

TLS Online TPP Program

#Id: 747

#Unit 3. Fundamental Processes

A:T and G:C base pairs have same geometry that’s why DNA polymerase has only one catalytic site for polymerization 

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#Id: 7377

#Unit 5. Developmental Biology

Bicoid mRNA binds to dynein, a “minus-directed” motor protein associated with the nongrowing end of microtubules; dynein moves the bicoid mRNA to the anterior end of the egg. 

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#Id: 6162

#Unit 12. Applied Biology

TLS Online TPP Program

#Id: 6000

#Unit 3. Fundamental Processes

The origin recognition complex (ORC) is a highly conserved complex found in all eukaryotes.  It is composed of six proteins with a mass of 400 kD.  ORC binds to the yeast A and B1 elements on the A-T–rich strand and is associated with ARS elements throughout the cell cycle.

TLS Online TPP Program

#Id: 4617

#Unit 13. Methods in Biology

 Scatchard plots are based on repeated equilibrium dialyses with a constant concentration of antibody and varying concentration of ligand. 
If all antibodies have the same affinity, then a Scatchard plot yields a straight line with a slope of Ka. The x intercept is n, the valency of the antibody, which is 2 for IgG and other divalent Igs. For IgM, which is pentameric, n  10, and for dimeric IgA, n  4. In this graph, antibody #1 has a higher affinity than antibody #2.