In vivo, a plasma Ca 2+ level low enough to interfere with blood clotting is incompatible with life. In vitro, clotting can be prevented if Ca 2+ is removed from the blood by the addition of substances such as oxalates or chelating agents.

TLS Online TPP Program

#Id: 9461

#Unit 4. Cell Communication and Cell Signaling

Active JAK kinase phosphorylates several tyrosine residues in the receptor’s cytosolic domain and activates a STAT transcription factor that moves directly to the nucleus

TLS Online TPP Program

#Id: 5518

#Unit 10. Ecological Principles

Net reproductive rate, the average number of female offspring produced by all the females in a population over the course of a generation.

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#Id: 2373

#Unit 5. Developmental Biology

In regenerating planaria, Notum is activated in the anterior-facing blastema, which generates a head.

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#Id: 6039

#Unit 10. Ecological Principles

Diversity within species 

450-700 (mycoplasma)

4000 in bacteria (eg. Escherichia coli)

13,000 in Fruit-fly (Drosophila melanogaster)

32,000 – 50,000 in rice (Oryza sativa)

35,000 to 45,000 in human beings (Homo sapiens sapiens). 

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#Id: 1664

#Unit 4. Cell Communication and Cell Signaling

For good vaccine

a. The vaccine must be safe

b. It must be effective in preventing infection

c. Activation of the humoral and cell-mediated

d. Development of long-term immunologic memory