Line X represents the course of an enzyme-catalysed reaction under optimum conditions.
Line Y shows the action of the same enzyme on the same substrate but with one variable changed: substrate concentration or pH or temperature.
Which changes to the variables could give the results shown by line Y?
1 decreased substrate concentration
2 higher pH
3 lower temperature
1 )
1, 2 and 3
2 )
1 and 2 only
3 )
1 and 3 only
2 and 3 only
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