<prompt> Most abundant collagen in bone is:Type IType IIType IIIType IV  <response>: Ans: a Type I Ref: Robbins, 7th ed, p. 1275; Harper, 27th ed, p. 546The proteins of bone include Type I collagen and a family of non collagenous proteins derived mainly from osteoblasts. Type I collagen forms the backbone of the matrix and accounts for 90 of total weight of the organic component.Types of collagenThere are around 19 types of collagen.Type I: Found in most connective tissue including bone.Type II: Cartilage, vitreous.Type III: Skin, lung, blood vessels.Type IV: Basement membrane.Regarding the other types.Type V, XII -Seen in bones.Type IX, XI- In cartilage. 