Plasmin is formed from its inactive precursor, plasminogen, by the action of thrombin and tissue-type plasminogen activator (t-PA).

TLS Online TPP Program

#Id: 1419

#Unit 4. Cell Communication and Cell Signaling

An integrin molecule is composed of two noncovalently associated transmembrane glycoprotein subunits called α and β.

TLS Online TPP Program

#Id: 6807

#Unit 3. Fundamental Processes

The precursor RNA for the siRNA pathway is a longer dsRNA. As a consequence of this different initial substrate, Drosha is not needed for the generation of siRNAs. Cleavage by Dicer is still required, however, and again generates a suitable 21- to 22-nucleotide RNA for incorporation into RISC.

TLS Online TPP Program

#Id: 1072

#Unit 5. Developmental Biology

Class A activity alone specifies sepals.

TLS Online TPP Program

#Id: 6357

#Unit 8. Inheritance Biology

Leber hereditary optic neuropathy (LHON) - People who have this disorder experience rapid loss of vision in both eyes, which results from the death of cells in the optic nerve.

TLS Online TPP Program

#Id: 8118

#Unit 1. Molecules and their Interaction Relevant to Biology

 Glycosphingolipids as determinants of blood groups.