Chemotaxis 

sperms are attracted toward eggs of their species by following a gradient of a chemical secreted by the egg.

TLS Online TPP Program

#Id: 2143

#Unit 9. Diversity of Life Forms

Plesiomorphic character- Primitive/unchange from ancestor Synplesiomorphic character- Primitive share ancestral character

TLS Online TPP Program

#Id: 9949

#Unit 4. Cell Communication and Cell Signaling

Resistance to leishmaniasis correlates well with the production of IFN-ϒ and the development of a TH1 response.

Strains of mice that are naturally resistant to Leishmania develop a TH1 response and produce IFN-ϒ upon infection. 

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#Id: 4734

#Unit 5. Developmental Biology

TLS Online TPP Program

#Id: 10462

#Unit 4. Cell Communication and Cell Signaling

MYC gene encodes a basic helix-loop-helix protein

include MAD, MAX, and MNT

TLS Online TPP Program

#Id: 1720

#Unit 4. Cell Communication and Cell Signaling

Most cells express a tetrameric form of FcεRI, which includes an α and β chain and two identical disulfide-linked γ chains.