Tag: enzyme catalysis

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Multiple choice chemistry surface chemistry enzyme catalysis catalysis proteins and enzymes

Enzymes, which catalyze biochemical reactions are very complex. They help in the reaction of very specific substances. This suggests that the enzyme and the reacting biochemicals are complementary to one another like a:

  1. dog in his kennel

  2. horse and a rider

  3. lock and key

  4. leaf and a bud
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Enzymes are very specific in nature. Only those substrates that can fit into the active site of an enzyme can be bound within it. This specific action is similar to a lock and key where a key(reacting biochemicals) can only be used to actuate a specific lock(enzyme) and not all of them. 

Multiple choice chemistry surface chemistry enzyme catalysis catalysis proteins and enzymes

Which of the following factors are responsible for the increase in the rate of a surface catalysed reaction?
I. A catalyst provides proper orientation for the reactant molecules to react
II. Heat of adsorption of reactants on a catalyst helps reactant molecules to.overcome activation energy
III. The catalyst increases the activation energy of the reaction 
IV. Adsorption increases the local concentration of reactant molecules on the surface of the catalyst
Select the correct answer using the codes given below:

  1. I and II

  2. I and III

  3. I, II and IV

  4. I, II and III
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A catalyst works by providing an alternative reaction pathway to the reaction product. The rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.