The key can be used to distinguish between four different chemical substances.
Use the key to identify which substance could be a protein.
1 contains the element carbon ........................................... go to 2
1 )
does not contain carbon ..................................................
2 contains the element nitrogen .........................................
does not contain nitrogen ............................................... go to 3
3 )
3 gives a positive result with Benedict’s test ......................
4 )
gives a negative result with Benedict’s test ....................
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