Malignant tumors are classified by their embryonic

tissue of origin:

Carcinomas -derive from epithelia such as endoderm

(gut epithelium) or ectoderm (skin and neural epithelia) 

Sarcomas - derive from mesoderm (muscle, blood, and

connective tissue precursors)

TLS Online TPP Program

#Id: 8157

#Unit 2. Cellular Organization

TLS Online TPP Program

#Id: 2863

#Unit 13. Methods in Biology

The electronic transitions of the peptide bond occur in the far UV. The intense peak at 190 nm, and the weaker one at 210–220 nm is due to the p ® p* and n ® p* transitions.

TLS Online TPP Program

#Id: 9141

#Unit 10. Ecological Principles

Mafia hypothesis – In Brood parasitism

Cuckoos or cowbirds check their host’s nests and destroy all eggs if their owner is not present. If the parasite egg has been removed, they destroy the host’s nest and kill or injure the nestlings.

TLS Online TPP Program

#Id: 9102

#Unit 4. Cell Communication and Cell Signaling

NO diffuses locally through tissues and activates an

intracellular NO receptor with guanylyl cyclase

activity in nearby smooth muscle cells

TLS Online TPP Program

#Id: 8126

#Unit 1. Molecules and their Interaction Relevant to Biology