Caspases function as homodimers with one domain of each stabilizing the active site of the other; they mediate apoptosis by proteolytic cleavage of selected substrates

TLS Online TPP Program

#Id: 1237

#Unit 7. System Physiology – Animal

TSH(thyrotropin)   Controls the secretion rate of thyroxine and triiodothyronine by the thyroid gland.

TLS Online TPP Program

#Id: 9258

#Unit 6. System Physiology – Plant

Photosynthetic photon flux density (PPFD)—the flux of light (usually expressed as micromoles per square meter per second [μmol m–2 s–1]) within the photosynthetically active range (400–700 nm).

TLS Online TPP Program

#Id: 8477

#Unit 1. Molecules and their Interaction Relevant to Biology

Each single strand of the b-sheet structure can be pictured as a twofold helix, that is, a helix with two residues per turn.

The arrangement of successive amide planes has a pleated appearance due to the tetrahedral nature of the Ca atom.

TLS Online TPP Program

#Id: 8523

#Unit 2. Cellular Organization

TLS Online TPP Program

#Id: 10394

#Unit 4. Cell Communication and Cell Signaling

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)