Biochemistry 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- A Carbohydrate B Ligand moiety C Calcium D All 💡 Explanation 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- ✓ Correct Answer: C. Calcium