Which statements about enzymes are correct?
1. Enzymes are proteins
2. Some enzymes carry out chemical digestion.
3. Enzymes speed up the rate of chemical reactions.
4. All enzymes work fastest at pH7.
1, 2 and 3
2 )
1 and 2 only
3 )
1 and 3 only
4 )
2, 3 and 4
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