Position effect variegation (PEV) 

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#Id: 9137

#Unit 10. Ecological Principles

Toxoplasma gondii

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#Id: 6402

#Unit 2. Cellular Organization

Attenuator riboswitch (Leader sequence) contains two major check-points in region 1

UGG codons on position 10, 11

A stop codon UGA between Region 1 and 2

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#Id: 8794

#Unit 10. Ecological Principles

COMMUNITY ZONATION - One of the most noticeable features of communities is that the species composition of the community changes as one moves across the landscape. 

With the change in environmental conditions, some species become better able to survive and compete. 

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#Unit 7. System Physiology – Animal

The influx of Ca2+ ions raises, triggering the fusion of insulin- containing secretory vesicles with the plasma membrane and the secretion of insulin

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#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.