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: 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)

TLS Online TPP Program

#Id: 8110

#Unit 1. Molecules and their Interaction Relevant to Biology

Archaea membrane lipids are isoprene-based lipids.

TLS Online TPP Program

#Id: 1379

#Unit 4. Cell Communication and Cell Signaling

The rate-limiting step in actin filament assembly is the formation of a short actin oligomer (nucleus).

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#Id: 4492

#Unit 13. Methods in Biology

ST segment - plateau portion of the ventricular action potential.

TLS Online TPP Program

#Id: 9104

#Unit 10. Ecological Principles

An interaction in which one organism, the predator, eats all or part of the body of another organism, the prey.