Biological roles of proteoglycans and hyaluronan include all of the following ex
ID: 39512 • Letter: B
Question
Biological roles of proteoglycans and hyaluronan include all of the following except:
A.
maintenance of porosity for the diffusion of small molecules between cells and tissues.
B.
presentation of growth factors to cells.
C.
resistance to compression.
D.
storage sites for extracellular energy reserves.
A.
maintenance of porosity for the diffusion of small molecules between cells and tissues.
B.
presentation of growth factors to cells.
C.
resistance to compression.
D.
storage sites for extracellular energy reserves.
Explanation / Answer
the proteoglycans are glycosylted proteins found in extracellular matrix and connective tissues. They allow the diffusion of small molecules between cells and tissues, they serve as lubricants and bind to cations and water. They are involved in storage function and exhibit resistance to compression. They do not exhibit the function of presenting growth factors to cells. Therefore option B is correct.
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