<prompt> The 40 nm gap in between the tropocollagen molecule in collagen which serve as the site of bone formation is occupied by which of the following-CarbohydrateLigand moietyCalciumAll  <response>: C i.e. Calcium40 nm gap between the typrocollagen molecues serve as nucleation site for deposition of hydroxyapatite I ca5p04319H,1 with some phosphate crystals in boneQ. 