Dicer will act on any dsRNA, regardless of sequence, and will cleave this molecule 22 nucleotides from its end.  The PAZ domain anchors the 3’ terminus of the substrate RNA to position the active sites of the enzyme 22 nucleotides away in a ruler-like fashion

TLS Online TPP Program

#Id: 9133

#Unit 10. Ecological Principles

Many species of macroparasites cannot complete their life cycles without the presence of at least two different host species

Definitive host - Exhibit sexual reproduction 

Intermediate hosts – Nonreproducing

TLS Online TPP Program

#Id: 9134

#Unit 10. Ecological Principles

Enslaver parasite - Many parasites induce changes in the behavior or color of one host, making that host more susceptible to being eaten by a second host.

TLS Online TPP Program

#Id: 9135

#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 9136

#Unit 10. Ecological Principles

Dicrocoelium dendritium

TLS Online TPP Program

#Id: 9137

#Unit 10. Ecological Principles

Toxoplasma gondii

TLS Online TPP Program

#Id: 9138

#Unit 10. Ecological Principles

Kleptoparasitism, meaning parasitism by theft, is a form of feeding where one animal takes food that another has caught.