The quaternary structure of collagen consists of three left-handed helices twisted into a right-handed coil.
Well, the primary structure of collagen is made up of a chain of repeating triplets (usually Gly-Pro-Hyp). Then, collagen is made up of three alpha helical chains that form a triple helix when...
hydrogen bonding, electrostatic attraction, hydrophili-hydrophobic
looks like a tiny funnel with a very long stem. Stem is quite unusual in that it is highly convoluted (it has many bends in it)
Conical firo-serous cac behind sternum and cartilage of 3-8th rib.