can anyone give 3 reasons when the temperature an enzyme is subjected to why the reaction time could increase?

Answer 1

1. Reaction is endothermic, requiring heat to overcome activation energy barrier

2. Increase in average kinetic energy of substrates, leading to greater number of collisions with enzyme

3. Increased activity of enzyme due to approaching maximal activity (all enzymes have optimal pH, temp. range)

Answer 2

If reaction time increases, the reaction is going slower, right?
Rates of reaction would suggest that the reaction should go faster if warmer, so the ONLY reason that I can think of is that the temperature has become too hot for the successful activity of the enzyme, which as eachonete said, have their own particular best operating ranges.

Answer 3

Don't know much about biology...but I imagine the reaction rate would initially favour an increase in temp to get the molecules sufficiently agitated to hit on the enzyme substrate for the desired rxn to be effected. At higher temps this would actually militate against molecules being sufficiently long enough in contact due to thermal agitation. At higher temps still the enzyme being made from protein would become 'denatured' ie lose its specific 'shape' and no longer be a template for the rxns to take place. Only two..I know.. and mere conjecture!