Boiling the bones and teeth from dead animals can be used to produce a type of glue.
The glue is formed from the collagen fibres present in bones and teeth.
Which statement describes the changes to collagen that occur when the glue is produced?
1 )
The fibres of collagen become more coiled.
2 )
The fibres of collagen become more flexible.
The helices of collagen molecules unwind.
4 )
The molecules of collagen dissolve in water.
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