In circulating blood, thrombin is a procoagulant that activates factors V and VIII, but when it binds to thrombomodulin, it becomes an anticoagulant in that the thrombomodulin–thrombin complex activates protein C.

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#Id: 6653

#Unit 8. Inheritance Biology

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#Id: 8654

#Unit 2. Cellular Organization

Sic1 inhibitor is degraded following its ubiquitinylation by the SCF ubiquitin-protein ligase

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#Id: 8907

#Unit 2. Cellular Organization

Centromere associated cohesins are specifically protected from phosphorylation dependent removal by protein phosphatase 2A

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#Id: 4622

#Unit 13. Methods in Biology

 A precipitation curve for a system of one antigen and its antibodies. This plot of the amount of antibody precipitated versus increasing antigen concentrations (at constant total antibody) reveals three zones: 

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#Id: 643

#Unit 3. Fundamental Processes

EMS causes ethylation of the bases in DNA at the 7-N and the 6-O positions of G cause G:C → A:T transitions.