The graph shows the effect of an increasing substrate concentration on the rate of an enzyme-catalysed reaction.
Line P represents the result when the enzyme is used at its optimum pH and optimum temperature and without an inhibitor.
Line Q represents the result when the reaction conditions are changed.
Which descriptions of changes to the reaction conditions could result in line Q if all other conditions were kept the same?
1- Add an inhibitor that attaches to a site other than the active site.
2- Add an inhibitor that has a similar shape to the substrate.
3- Add an inhibitor that blocks the active site of the enzyme.
4- Carry out the reaction at a higher temperature.
1 )
1, 3 and 4
2 )
1 and 4 only
3 )
2, 3 and 4
2 and 3 only
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