The nursing student has a good understanding of glycoproteins when he states which of the fol-lowing glycoproteins are present in the bone? (select all that apply)
a. Osteocalcin
b. Sialoprotein
c. Bone albumin
d. Alpha-glycoprotein
e. Collagen
ANS: A, B, C, D
Four glycoproteins are present in bone: sialoprotein, which binds easily with calcium; osteocalcin, which binds preferentially to crystallized calcium; bone albumin, which is identical to serum al-bumin and possibly transports essential nutrients to and from bone cells and maintains the os-motic pressure of bone fluid; and alpha-glycoprotein (?-glycoprotein). Collagen is not a glycopro-tein.
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