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Answer» `{:(""X,""Y),("Activation energy without enzyme", "Activation energy with enzyme"):}`
`{:(""X,""Y),("Activation energy with enzyme", "Activation energy without enzyme"):}`
`{:(""X,""Y),("Substrate concentration with enzyme", "Substrate concentration without enzyme"):}`
`{:(""X,""Y),("Substrate concentration without enzyme", "Substrate concentration with enzyme"):}` SOLUTION :Most reactions do not start automatically because the reactions have an energy barrier which may be due to hydrogen bonding, absence of precise collisions due to small reactive site, mutual REPULSION, etc. external SUPPLY of energy needed to overcome this barries is known as activation energy. The enzyme lowers the activation energy of the reaction and allows a large number of moles to react at a time.
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