Ectoparasite A parasite that lives on the outside of an organism.

Endoparasite A parasite that lives inside an organism.

TLS Online TPP Program

#Id: 9073

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 1356

#Unit 4. Cell Communication and Cell Signaling

The cytokines form a family of small, secreted signaling molecules (about 160–200 amino acids) that control growth and differentiation of cells.

TLS Online TPP Program

#Id: 4012

#Unit 7. System Physiology – Animal

The inherent leakiness of the sinus nodal fibers to sodium and calcium ions causes their self-excitation.

TLS Online TPP Program

#Id: 8040

#Unit 1. Molecules and their Interaction Relevant to Biology

TLS Online TPP Program

#Id: 7068

#Unit 3. Fundamental Processes

Class I enzymes attach the amino acid to the 2’-OH of the tRNA and are generally monomeric. Class II enzymes attach the amino acid to the 3’-OH of the tRNA and are typically dimeric or tetrameric.The amino acids for which the Class I synthetases are specific tend to be larger and more hydrophobic than those for Class II synthetases.