Which of the following statements is TRUE regarding the effect of temperature on enzyme-catalyzed reactions?
Increasing temperature always increases the rate of an enzyme-catalyzed reaction until the enzyme denatures.
The optimum temperature for an enzyme is always 37°C.
Enzymes are not affected by changes in temperature.
Decreasing temperature always decreases the rate of an enzyme-catalyzed reaction.
Related Questions
The catalyst used in the manufacture of nitric acid by Ostwald’s process is :
Mo
Pt
Fe
The catalyst used in lead chamber process of manufacture is
Platinum
Oxides of nitrogen
Nickel
Vanadium compounds
In Haber’s process for manufacture of ammonia, the reaction is usually carried at about . If a temperature of about was used then
A catalyst would be of no use at all at this temperature
The rate of formation of ammonia would be too slow
No ammonia would be formed at all
The percentage of ammonia in the equilibrium mixture would be too low
When a catalyst increases the rate of a chemical reaction, the rate constant :
Increases
Decreases
Remains constant
Becomes infinite
Catalyst :
Lowers activation energy
Increase activation energy
May increase or may decrease activation energy
Brings out equilibrium
acts as …..for Pd in Rosenmund’s reaction:
Promoter
Poison
Autocatalyst
None of these
Negative catalyst or inhibitor is one :
Which retards the rate of reaction
Takes the reaction in forward direction
Promotes the side reaction
None of the above
A catalyst is a substance which
Increases the equilibrium constant of the reaction
Increases equilibrium concentration of products
Does not alter the reaction mechanism
Changes the activation energy of the reaction
A catalyst :
Increases the average kinetic energy of the reacting molecules
Increases the activation energy
Alters the reaction mechanism
Increases the frequency of collisions of the reacting species
The decomposition of may be checked by adding a small quantity of phosphoric acid. This is an example of :
Neutralization
Negative catalysis
Positive catalysis
Catalytic poisoning
